Update translation files

Updated by "Update PO files to match POT (msgmerge)" hook in Weblate.

Translation: Internet Archive/Archive Scholar (web interface)
Translate-URL: https://hosted.weblate.org/projects/internetarchive/fatcat-scholar/

14 files changed, 740 insertions, 626 deletions

diff --git a/fatcat_scholar/translations/ar/LC_MESSAGES/messages.po b/fatcat_scholar/translations/ar/LC_MESSAGES/messages.po
index 870959c..acb3e8a 100644
--- a/fatcat_scholar/translations/ar/LC_MESSAGES/messages.po
+++ b/fatcat_scholar/translations/ar/LC_MESSAGES/messages.po
@@ -7,7 +7,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: PROJECT VERSION\n"
 "Report-Msgid-Bugs-To: EMAIL@ADDRESS\n"
-"POT-Creation-Date: 2021-08-12 16:37-0700\n"
+"POT-Creation-Date: 2021-11-10 16:26-0800\n"
 "PO-Revision-Date: 2021-03-26 18:29+0000\n"
 "Last-Translator: Bryan Newbold <bnewbold@robocracy.org>\n"
 "Language-Team: Arabic <https://hosted.weblate.org/projects/internetarchive/"
@@ -21,83 +21,83 @@ msgstr ""
 "X-Generator: Weblate 4.6-dev\n"
 "Generated-By: Babel 2.8.0\n"
 
-#: fatcat_scholar/search.py:44
+#: fatcat_scholar/search.py:45
 msgid "Release Date"
 msgstr "تاريخ الإصدار"
 
-#: fatcat_scholar/search.py:48
+#: fatcat_scholar/search.py:49
 msgid "All Time"
 msgstr "كل الوقت"
 
-#: fatcat_scholar/search.py:49
+#: fatcat_scholar/search.py:50
 msgid "Past Week"
 msgstr "الأسبوع الماضي"
 
-#: fatcat_scholar/search.py:50
+#: fatcat_scholar/search.py:51
 msgid "Past Year"
 msgstr "العام الماضي"
 
-#: fatcat_scholar/search.py:51
+#: fatcat_scholar/search.py:52
 msgid "Since 2000"
 msgstr "منذ عام 2000"
 
-#: fatcat_scholar/search.py:52
+#: fatcat_scholar/search.py:53
 msgid "Before 1925"
 msgstr "قبل عام 1925"
 
-#: fatcat_scholar/search.py:56
+#: fatcat_scholar/search.py:57
 msgid "Resource Type"
 msgstr "نوع المورد"
 
-#: fatcat_scholar/search.py:60
+#: fatcat_scholar/search.py:61
 msgid "Papers"
 msgstr "أوراق"
 
-#: fatcat_scholar/search.py:61
+#: fatcat_scholar/search.py:62
 msgid "Reports"
 msgstr "التقارير"
 
-#: fatcat_scholar/search.py:62
+#: fatcat_scholar/search.py:63
 msgid "Datasets"
 msgstr "مجموعات البيانات"
 
-#: fatcat_scholar/search.py:63
+#: fatcat_scholar/search.py:64
 msgid "Everything"
 msgstr "كل شىء"
 
-#: fatcat_scholar/search.py:67
+#: fatcat_scholar/search.py:68
 msgid "Availability"
 msgstr "الإتاحة"
 
-#: fatcat_scholar/search.py:71
+#: fatcat_scholar/search.py:72
 msgid "Fulltext"
 msgstr "النص كاملا"
 
-#: fatcat_scholar/search.py:72
+#: fatcat_scholar/search.py:73
 msgid "Microfilm"
 msgstr "ميكروفيلم"
 
-#: fatcat_scholar/search.py:73 fatcat_scholar/templates/search_macros.html:4
+#: fatcat_scholar/search.py:74 fatcat_scholar/templates/search_macros.html:4
 msgid "Open Access"
 msgstr "الوصول المفتوح"
 
-#: fatcat_scholar/search.py:74
+#: fatcat_scholar/search.py:75
 msgid "Metadata"
 msgstr "بيانات التعريف"
 
-#: fatcat_scholar/search.py:78
+#: fatcat_scholar/search.py:79
 msgid "Sort Order"
 msgstr "ترتيب الفرز"
 
-#: fatcat_scholar/search.py:82
+#: fatcat_scholar/search.py:83
 msgid "Relevancy"
 msgstr "الصلة"
 
-#: fatcat_scholar/search.py:83
+#: fatcat_scholar/search.py:84
 msgid "Recent First"
 msgstr "الأخيرة أولاً"
 
-#: fatcat_scholar/search.py:84
+#: fatcat_scholar/search.py:85
 msgid "Oldest First"
 msgstr "الأقدم أولا"
 
@@ -120,7 +120,7 @@ msgstr ""
 "بعض الأخطاء والمشكلات المعروفة"
 
 #: fatcat_scholar/templates/about.html:14
-#: fatcat_scholar/templates/base.html:196
+#: fatcat_scholar/templates/base.html:197
 msgid "How It Works"
 msgstr "كيف تعمل"
 
@@ -160,7 +160,7 @@ msgstr ""
 "على البنية التحتية التقنية وأهداف المشروع بشكل عام."
 
 #: fatcat_scholar/templates/about.html:27
-#: fatcat_scholar/templates/base.html:197
+#: fatcat_scholar/templates/base.html:198
 msgid "Content Sources"
 msgstr "مصادر المحتوى"
 
@@ -180,7 +180,7 @@ msgstr ""
 "<a href=\"#contact\"> اتصل بنا </a> إذا كانت لديك أسئلة."
 
 #: fatcat_scholar/templates/about.html:35
-#: fatcat_scholar/templates/base.html:198
+#: fatcat_scholar/templates/base.html:199
 msgid "Text and Data Mining"
 msgstr "التنقيب عن النصوص والبيانات"
 
@@ -308,35 +308,35 @@ msgstr ""
 msgid "Fatcat catalog page"
 msgstr ""
 
-#: fatcat_scholar/templates/base.html:12
+#: fatcat_scholar/templates/base.html:13
 msgid "Internet Archive Scholar"
 msgstr "باحث أرشيف الإنترنت"
 
-#: fatcat_scholar/templates/base.html:82
+#: fatcat_scholar/templates/base.html:83
 msgid "language selection menu"
 msgstr "قائمة اختيار اللغة"
 
-#: fatcat_scholar/templates/base.html:104
+#: fatcat_scholar/templates/base.html:105
 msgid "Contribute to translations"
 msgstr "المساهمة في الترجمات"
 
-#: fatcat_scholar/templates/base.html:127
+#: fatcat_scholar/templates/base.html:128
 msgid "by title, authors, keywords..."
 msgstr "حسب العنوان والمؤلفين والكلمات الرئيسية ..."
 
-#: fatcat_scholar/templates/base.html:127
+#: fatcat_scholar/templates/base.html:128
 msgid "search for papers"
 msgstr "البحث عن الأوراق"
 
-#: fatcat_scholar/templates/base.html:128 fatcat_scholar/templates/home.html:16
+#: fatcat_scholar/templates/base.html:129 fatcat_scholar/templates/home.html:16
 msgid "Search"
 msgstr "بحث"
 
-#: fatcat_scholar/templates/base.html:138
+#: fatcat_scholar/templates/base.html:139
 msgid "User Guide"
 msgstr "دليل المستخدم"
 
-#: fatcat_scholar/templates/base.html:166
+#: fatcat_scholar/templates/base.html:167
 msgid ""
 "We are a US 501(c)(3) non-profit library, building a global archive of "
 "Internet sites and other cultural artifacts in digital form."
@@ -344,7 +344,7 @@ msgstr ""
 "نحن مكتبة أمريكية غير هادفة للربح 501 (ج) (3) ، نبني أرشيفًا عالميًا لمواقع "
 "الإنترنت والتحف الثقافية الأخرى في شكل رقمي."
 
-#: fatcat_scholar/templates/base.html:168
+#: fatcat_scholar/templates/base.html:169
 #, python-format
 msgid ""
 "Other projects include %(wayback)s, %(archive_org)s, %(openlibrary)s, and "
@@ -353,47 +353,47 @@ msgstr ""
 "تشمل المشاريع الأخرى %(wayback)s و %(archive_org)s و %(openlibrary)s و "
 "%(archive_it)s."
 
-#: fatcat_scholar/templates/base.html:175
+#: fatcat_scholar/templates/base.html:176
 msgid "About Us"
 msgstr "معلومات عنا"
 
-#: fatcat_scholar/templates/base.html:176
+#: fatcat_scholar/templates/base.html:177
 msgid "Contact Us"
 msgstr "اتصل بنا"
 
-#: fatcat_scholar/templates/base.html:177
+#: fatcat_scholar/templates/base.html:178
 msgid "Policies"
 msgstr "سياسات"
 
-#: fatcat_scholar/templates/base.html:178
+#: fatcat_scholar/templates/base.html:179
 msgid "Donate"
 msgstr "تبرع"
 
-#: fatcat_scholar/templates/base.html:184
+#: fatcat_scholar/templates/base.html:185
 msgid "Open Infrastructure"
 msgstr "فتح البنية التحتية"
 
-#: fatcat_scholar/templates/base.html:186
+#: fatcat_scholar/templates/base.html:187
 msgid "Editable Catalog (Fatcat)"
 msgstr "كتالوج قابل للتحرير (Fatcat)"
 
-#: fatcat_scholar/templates/base.html:187
+#: fatcat_scholar/templates/base.html:188
 msgid "Contribute"
 msgstr "المساهمة"
 
-#: fatcat_scholar/templates/base.html:188
+#: fatcat_scholar/templates/base.html:189
 msgid "Search API"
 msgstr "بحث API"
 
-#: fatcat_scholar/templates/base.html:189
+#: fatcat_scholar/templates/base.html:190
 msgid "Service Status"
 msgstr "حالة الخدمة"
 
-#: fatcat_scholar/templates/base.html:190
+#: fatcat_scholar/templates/base.html:191
 msgid "Source Code"
 msgstr "الشفرة المصدرية"
 
-#: fatcat_scholar/templates/base.html:199
+#: fatcat_scholar/templates/base.html:200
 msgid "Help"
 msgstr "ساعدني"
 
@@ -639,6 +639,10 @@ msgstr ""
 "إذا تمت أرشفة العمل بالكامل على نظام أساسي مفتوح وموثوق ، فسنوفر أحيانًا "
 "روابط إضافية"
 
+#: fatcat_scholar/templates/help.html:148
+msgid "Tags"
+msgstr ""
+
 #: fatcat_scholar/templates/help.html:150
 msgid ""
 "Search results may have tag labels which provide additional context about "
@@ -727,6 +731,10 @@ msgstr ""
 "محفوظة و / أو مستضافة على <a href=\"https://en.wikipedia.org/wiki/JSTOR\"> "
 "JSTOR </a> منصة الحفظ الرقمية"
 
+#: fatcat_scholar/templates/help.html:198
+msgid "Persistent Identifiers"
+msgstr ""
+
 #: fatcat_scholar/templates/help.html:200
 msgid ""
 "Underneath search results, and alternate version listings, are any known "
diff --git a/fatcat_scholar/translations/de/LC_MESSAGES/messages.po b/fatcat_scholar/translations/de/LC_MESSAGES/messages.po
index 2861b3c..7ed3dc0 100644
--- a/fatcat_scholar/translations/de/LC_MESSAGES/messages.po
+++ b/fatcat_scholar/translations/de/LC_MESSAGES/messages.po
@@ -12,7 +12,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: PROJECT VERSION\n"
 "Report-Msgid-Bugs-To: EMAIL@ADDRESS\n"
-"POT-Creation-Date: 2021-08-12 16:37-0700\n"
+"POT-Creation-Date: 2021-11-10 16:26-0800\n"
 "PO-Revision-Date: 2021-04-13 00:26+0000\n"
 "Last-Translator: J. Lavoie <j.lavoie@net-c.ca>\n"
 "Language-Team: German <https://hosted.weblate.org/projects/internetarchive/"
@@ -25,83 +25,83 @@ msgstr ""
 "X-Generator: Weblate 4.6-dev\n"
 "Generated-By: Babel 2.8.0\n"
 
-#: fatcat_scholar/search.py:44
+#: fatcat_scholar/search.py:45
 msgid "Release Date"
 msgstr "Datum"
 
-#: fatcat_scholar/search.py:48
+#: fatcat_scholar/search.py:49
 msgid "All Time"
 msgstr "Beliebige Zeit"
 
-#: fatcat_scholar/search.py:49
+#: fatcat_scholar/search.py:50
 msgid "Past Week"
 msgstr "Letzte Woche"
 
-#: fatcat_scholar/search.py:50
+#: fatcat_scholar/search.py:51
 msgid "Past Year"
 msgstr "Letztes Jahr"
 
-#: fatcat_scholar/search.py:51
+#: fatcat_scholar/search.py:52
 msgid "Since 2000"
 msgstr "Seit 2000"
 
-#: fatcat_scholar/search.py:52
+#: fatcat_scholar/search.py:53
 msgid "Before 1925"
 msgstr "Vor 1925"
 
-#: fatcat_scholar/search.py:56
+#: fatcat_scholar/search.py:57
 msgid "Resource Type"
 msgstr "Ressourcenart"
 
-#: fatcat_scholar/search.py:60
+#: fatcat_scholar/search.py:61
 msgid "Papers"
 msgstr "Artikel"
 
-#: fatcat_scholar/search.py:61
+#: fatcat_scholar/search.py:62
 msgid "Reports"
 msgstr "Berichte"
 
-#: fatcat_scholar/search.py:62
+#: fatcat_scholar/search.py:63
 msgid "Datasets"
 msgstr "Datensätze"
 
-#: fatcat_scholar/search.py:63
+#: fatcat_scholar/search.py:64
 msgid "Everything"
 msgstr "Alles"
 
-#: fatcat_scholar/search.py:67
+#: fatcat_scholar/search.py:68
 msgid "Availability"
 msgstr "Verfügbarkeit"
 
-#: fatcat_scholar/search.py:71
+#: fatcat_scholar/search.py:72
 msgid "Fulltext"
 msgstr "Voller Text"
 
-#: fatcat_scholar/search.py:72
+#: fatcat_scholar/search.py:73
 msgid "Microfilm"
 msgstr "Mikrofilm"
 
-#: fatcat_scholar/search.py:73 fatcat_scholar/templates/search_macros.html:4
+#: fatcat_scholar/search.py:74 fatcat_scholar/templates/search_macros.html:4
 msgid "Open Access"
 msgstr "Offener Zugang"
 
-#: fatcat_scholar/search.py:74
+#: fatcat_scholar/search.py:75
 msgid "Metadata"
 msgstr "Metadaten"
 
-#: fatcat_scholar/search.py:78
+#: fatcat_scholar/search.py:79
 msgid "Sort Order"
 msgstr "Sortierreihenfolge"
 
-#: fatcat_scholar/search.py:82
+#: fatcat_scholar/search.py:83
 msgid "Relevancy"
 msgstr "Relevanz"
 
-#: fatcat_scholar/search.py:83
+#: fatcat_scholar/search.py:84
 msgid "Recent First"
 msgstr "Neueste zuerst"
 
-#: fatcat_scholar/search.py:84
+#: fatcat_scholar/search.py:85
 msgid "Oldest First"
 msgstr "Älteste zuerst"
 
@@ -124,7 +124,7 @@ msgstr ""
 "einige Bugs und bekannte Probleme auflistet"
 
 #: fatcat_scholar/templates/about.html:14
-#: fatcat_scholar/templates/base.html:196
+#: fatcat_scholar/templates/base.html:197
 msgid "How It Works"
 msgstr "Wie es funktioniert"
 
@@ -165,7 +165,7 @@ msgstr ""
 "Überblick über die technische Infrastruktur und die Ziele des Gesamtprojekts."
 
 #: fatcat_scholar/templates/about.html:27
-#: fatcat_scholar/templates/base.html:197
+#: fatcat_scholar/templates/base.html:198
 msgid "Content Sources"
 msgstr "Datenquellen"
 
@@ -186,7 +186,7 @@ msgstr ""
 "<a href=\"#contact\">kontaktieren Sie uns</a>, wenn Sie Fragen haben."
 
 #: fatcat_scholar/templates/about.html:35
-#: fatcat_scholar/templates/base.html:198
+#: fatcat_scholar/templates/base.html:199
 msgid "Text and Data Mining"
 msgstr "Text- und Datenuntersuchung"
 
@@ -323,35 +323,35 @@ msgstr "Zugang zur Fatcat-Landingpage"
 msgid "Fatcat catalog page"
 msgstr "Zugang zur Fatcat-Landingpage"
 
-#: fatcat_scholar/templates/base.html:12
+#: fatcat_scholar/templates/base.html:13
 msgid "Internet Archive Scholar"
 msgstr "Internet Archive Scholar"
 
-#: fatcat_scholar/templates/base.html:82
+#: fatcat_scholar/templates/base.html:83
 msgid "language selection menu"
 msgstr "Sprachauswahl-Menü"
 
-#: fatcat_scholar/templates/base.html:104
+#: fatcat_scholar/templates/base.html:105
 msgid "Contribute to translations"
 msgstr "Übersetzungen hinzufügen"
 
-#: fatcat_scholar/templates/base.html:127
+#: fatcat_scholar/templates/base.html:128
 msgid "by title, authors, keywords..."
 msgstr "nach Titel, Autoren, Schlüsselwörtern …"
 
-#: fatcat_scholar/templates/base.html:127
+#: fatcat_scholar/templates/base.html:128
 msgid "search for papers"
 msgstr "Artikel suchen"
 
-#: fatcat_scholar/templates/base.html:128 fatcat_scholar/templates/home.html:16
+#: fatcat_scholar/templates/base.html:129 fatcat_scholar/templates/home.html:16
 msgid "Search"
 msgstr "Suche"
 
-#: fatcat_scholar/templates/base.html:138
+#: fatcat_scholar/templates/base.html:139
 msgid "User Guide"
 msgstr "Benutzerhandbuch"
 
-#: fatcat_scholar/templates/base.html:166
+#: fatcat_scholar/templates/base.html:167
 msgid ""
 "We are a US 501(c)(3) non-profit library, building a global archive of "
 "Internet sites and other cultural artifacts in digital form."
@@ -360,7 +360,7 @@ msgstr ""
 "Archiv von Internetseiten und anderen kulturellen Er­zeug­nissen in digitaler "
 "Form erstellt."
 
-#: fatcat_scholar/templates/base.html:168
+#: fatcat_scholar/templates/base.html:169
 #, python-format
 msgid ""
 "Other projects include %(wayback)s, %(archive_org)s, %(openlibrary)s, and "
@@ -369,47 +369,47 @@ msgstr ""
 "Weitere Projekte sind %(wayback)s, %(archive_org)s, %(openlibrary)s und "
 "%(archive_it)s."
 
-#: fatcat_scholar/templates/base.html:175
+#: fatcat_scholar/templates/base.html:176
 msgid "About Us"
 msgstr "Über uns"
 
-#: fatcat_scholar/templates/base.html:176
+#: fatcat_scholar/templates/base.html:177
 msgid "Contact Us"
 msgstr "Kontakt"
 
-#: fatcat_scholar/templates/base.html:177
+#: fatcat_scholar/templates/base.html:178
 msgid "Policies"
 msgstr "Richtlinien"
 
-#: fatcat_scholar/templates/base.html:178
+#: fatcat_scholar/templates/base.html:179
 msgid "Donate"
 msgstr "Spenden"
 
-#: fatcat_scholar/templates/base.html:184
+#: fatcat_scholar/templates/base.html:185
 msgid "Open Infrastructure"
 msgstr "Offene Infrastruktur"
 
-#: fatcat_scholar/templates/base.html:186
+#: fatcat_scholar/templates/base.html:187
 msgid "Editable Catalog (Fatcat)"
 msgstr "Bearbeitbarer Katalog (Fatcat)"
 
-#: fatcat_scholar/templates/base.html:187
+#: fatcat_scholar/templates/base.html:188
 msgid "Contribute"
 msgstr "Mitmachen"
 
-#: fatcat_scholar/templates/base.html:188
+#: fatcat_scholar/templates/base.html:189
 msgid "Search API"
 msgstr "Such-API"
 
-#: fatcat_scholar/templates/base.html:189
+#: fatcat_scholar/templates/base.html:190
 msgid "Service Status"
 msgstr "Dienststatus"
 
-#: fatcat_scholar/templates/base.html:190
+#: fatcat_scholar/templates/base.html:191
 msgid "Source Code"
 msgstr "Quellcode"
 
-#: fatcat_scholar/templates/base.html:199
+#: fatcat_scholar/templates/base.html:200
 msgid "Help"
 msgstr "Hilfe"
 
@@ -669,6 +669,10 @@ msgstr ""
 "Wenn das Werk vollständig auf einer zuverlässigen, offenen Plattform "
 "archiviert ist, werden wir manchmal zusätzliche Links bereitstellen"
 
+#: fatcat_scholar/templates/help.html:148
+msgid "Tags"
+msgstr ""
+
 #: fatcat_scholar/templates/help.html:150
 msgid ""
 "Search results may have tag labels which provide additional context about "
@@ -758,6 +762,10 @@ msgstr ""
 "Konserviert und/oder gehostet auf der <a href=\"https://en.wikipedia.org/"
 "wiki/JSTOR\">JSTOR</a> Plattform für digitale Bewahrung"
 
+#: fatcat_scholar/templates/help.html:198
+msgid "Persistent Identifiers"
+msgstr ""
+
 #: fatcat_scholar/templates/help.html:200
 msgid ""
 "Underneath search results, and alternate version listings, are any known "
diff --git a/fatcat_scholar/translations/el/LC_MESSAGES/messages.po b/fatcat_scholar/translations/el/LC_MESSAGES/messages.po
index 8fc03fc..fa7ca46 100644
--- a/fatcat_scholar/translations/el/LC_MESSAGES/messages.po
+++ b/fatcat_scholar/translations/el/LC_MESSAGES/messages.po
@@ -9,7 +9,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: PROJECT VERSION\n"
 "Report-Msgid-Bugs-To: EMAIL@ADDRESS\n"
-"POT-Creation-Date: 2021-08-12 16:37-0700\n"
+"POT-Creation-Date: 2021-11-10 16:26-0800\n"
 "PO-Revision-Date: 2021-08-02 12:32+0000\n"
 "Last-Translator: Georgios Pitsiladis <g.v.pitsiladis@gmail.com>\n"
 "Language-Team: Greek <https://hosted.weblate.org/projects/internetarchive/"
@@ -22,83 +22,83 @@ msgstr ""
 "X-Generator: Weblate 4.8-dev\n"
 "Generated-By: Babel 2.6.0\n"
 
-#: fatcat_scholar/search.py:44
+#: fatcat_scholar/search.py:45
 msgid "Release Date"
 msgstr "ημερομηνία κυκλοφορίας"
 
-#: fatcat_scholar/search.py:48
+#: fatcat_scholar/search.py:49
 msgid "All Time"
 msgstr "Όλος ο χρόνος"
 
-#: fatcat_scholar/search.py:49
+#: fatcat_scholar/search.py:50
 msgid "Past Week"
 msgstr "Προηγούμενη εβδομάδα"
 
-#: fatcat_scholar/search.py:50
+#: fatcat_scholar/search.py:51
 msgid "Past Year"
 msgstr "Προηγούμενος χρόνος"
 
-#: fatcat_scholar/search.py:51
+#: fatcat_scholar/search.py:52
 msgid "Since 2000"
 msgstr "Από το 2000"
 
-#: fatcat_scholar/search.py:52
+#: fatcat_scholar/search.py:53
 msgid "Before 1925"
 msgstr "Πριν το 1995"
 
-#: fatcat_scholar/search.py:56
+#: fatcat_scholar/search.py:57
 msgid "Resource Type"
 msgstr "Τύπος Πόρου"
 
-#: fatcat_scholar/search.py:60
+#: fatcat_scholar/search.py:61
 msgid "Papers"
 msgstr "Έγγραφα"
 
-#: fatcat_scholar/search.py:61
+#: fatcat_scholar/search.py:62
 msgid "Reports"
 msgstr "Αναφορές"
 
-#: fatcat_scholar/search.py:62
+#: fatcat_scholar/search.py:63
 msgid "Datasets"
 msgstr "Σύνολα δεδομένων"
 
-#: fatcat_scholar/search.py:63
+#: fatcat_scholar/search.py:64
 msgid "Everything"
 msgstr "Τα πάντα"
 
-#: fatcat_scholar/search.py:67
+#: fatcat_scholar/search.py:68
 msgid "Availability"
 msgstr "Διαθεσιμότητα"
 
-#: fatcat_scholar/search.py:71
+#: fatcat_scholar/search.py:72
 msgid "Fulltext"
 msgstr "Πλήρες κείμενο"
 
-#: fatcat_scholar/search.py:72
+#: fatcat_scholar/search.py:73
 msgid "Microfilm"
 msgstr "Μικροφίλμ"
 
-#: fatcat_scholar/search.py:73 fatcat_scholar/templates/search_macros.html:4
+#: fatcat_scholar/search.py:74 fatcat_scholar/templates/search_macros.html:4
 msgid "Open Access"
 msgstr "Ανοικτή πρόσβαση"
 
-#: fatcat_scholar/search.py:74
+#: fatcat_scholar/search.py:75
 msgid "Metadata"
 msgstr "Μέτα δεδομένα"
 
-#: fatcat_scholar/search.py:78
+#: fatcat_scholar/search.py:79
 msgid "Sort Order"
 msgstr "Σειρά ταξινόμησης"
 
-#: fatcat_scholar/search.py:82
+#: fatcat_scholar/search.py:83
 msgid "Relevancy"
 msgstr "Σχετικότητα"
 
-#: fatcat_scholar/search.py:83
+#: fatcat_scholar/search.py:84
 msgid "Recent First"
 msgstr "Πρόσφατα πρώτα"
 
-#: fatcat_scholar/search.py:84
+#: fatcat_scholar/search.py:85
 msgid "Oldest First"
 msgstr "Πρώτα τα παλαιότερα"
 
@@ -121,7 +121,7 @@ msgstr ""
 "απαριθμεί κάποια σφάλματα και γνωστά προβλήματα"
 
 #: fatcat_scholar/templates/about.html:14
-#: fatcat_scholar/templates/base.html:196
+#: fatcat_scholar/templates/base.html:197
 msgid "How It Works"
 msgstr "Πώς λειτουργεί"
 
@@ -157,7 +157,7 @@ msgid ""
 msgstr ""
 
 #: fatcat_scholar/templates/about.html:27
-#: fatcat_scholar/templates/base.html:197
+#: fatcat_scholar/templates/base.html:198
 msgid "Content Sources"
 msgstr "Πηγές περιεχομένου"
 
@@ -171,7 +171,7 @@ msgid ""
 msgstr ""
 
 #: fatcat_scholar/templates/about.html:35
-#: fatcat_scholar/templates/base.html:198
+#: fatcat_scholar/templates/base.html:199
 msgid "Text and Data Mining"
 msgstr "Εξόρυξη κειμένου και δεδομένων"
 
@@ -293,35 +293,35 @@ msgstr ""
 msgid "Fatcat catalog page"
 msgstr ""
 
-#: fatcat_scholar/templates/base.html:12
+#: fatcat_scholar/templates/base.html:13
 msgid "Internet Archive Scholar"
 msgstr "Internet Archive Scholar"
 
-#: fatcat_scholar/templates/base.html:82
+#: fatcat_scholar/templates/base.html:83
 msgid "language selection menu"
 msgstr "μενού επιλογής γλώσσας"
 
-#: fatcat_scholar/templates/base.html:104
+#: fatcat_scholar/templates/base.html:105
 msgid "Contribute to translations"
 msgstr "Συμβάλλετε στις μεταφράσεις"
 
-#: fatcat_scholar/templates/base.html:127
+#: fatcat_scholar/templates/base.html:128
 msgid "by title, authors, keywords..."
 msgstr "με βάση τον τίτλο, τους συγγραφείς, τις λέξεις-κλειδιά..."
 
-#: fatcat_scholar/templates/base.html:127
+#: fatcat_scholar/templates/base.html:128
 msgid "search for papers"
 msgstr "αναζήτηση εγγράφων"
 
-#: fatcat_scholar/templates/base.html:128 fatcat_scholar/templates/home.html:16
+#: fatcat_scholar/templates/base.html:129 fatcat_scholar/templates/home.html:16
 msgid "Search"
 msgstr "Αναζήτηση"
 
-#: fatcat_scholar/templates/base.html:138
+#: fatcat_scholar/templates/base.html:139
 msgid "User Guide"
 msgstr "Οδηγός χρήστη"
 
-#: fatcat_scholar/templates/base.html:166
+#: fatcat_scholar/templates/base.html:167
 msgid ""
 "We are a US 501(c)(3) non-profit library, building a global archive of "
 "Internet sites and other cultural artifacts in digital form."
@@ -330,7 +330,7 @@ msgstr ""
 "ένα παγκόσμιο αρχείο ιστότοπων στο Διαδίκτυο και άλλων πολιτιστικών "
 "αντικειμένων σε ψηφιακή μορφή."
 
-#: fatcat_scholar/templates/base.html:168
+#: fatcat_scholar/templates/base.html:169
 #, python-format
 msgid ""
 "Other projects include %(wayback)s, %(archive_org)s, %(openlibrary)s, and "
@@ -339,47 +339,47 @@ msgstr ""
 "Άλλα έργα περιλαμβάνουν %(wayback)s, %(archive_org)s, %(openlibrary)s και "
 "%(archive_it)s."
 
-#: fatcat_scholar/templates/base.html:175
+#: fatcat_scholar/templates/base.html:176
 msgid "About Us"
 msgstr "Σχετικά με εμάς"
 
-#: fatcat_scholar/templates/base.html:176
+#: fatcat_scholar/templates/base.html:177
 msgid "Contact Us"
 msgstr "Επικοινωνήστε μαζί μας"
 
-#: fatcat_scholar/templates/base.html:177
+#: fatcat_scholar/templates/base.html:178
 msgid "Policies"
 msgstr "Μανιφέστο"
 
-#: fatcat_scholar/templates/base.html:178
+#: fatcat_scholar/templates/base.html:179
 msgid "Donate"
 msgstr "Δωρείστε"
 
-#: fatcat_scholar/templates/base.html:184
+#: fatcat_scholar/templates/base.html:185
 msgid "Open Infrastructure"
 msgstr "Ανοιχτή υποδομή"
 
-#: fatcat_scholar/templates/base.html:186
+#: fatcat_scholar/templates/base.html:187
 msgid "Editable Catalog (Fatcat)"
 msgstr "Κατάλογος με δυνατότητα επεξεργασίας (Fatcat)"
 
-#: fatcat_scholar/templates/base.html:187
+#: fatcat_scholar/templates/base.html:188
 msgid "Contribute"
 msgstr "Συνεισφέρετε"
 
-#: fatcat_scholar/templates/base.html:188
+#: fatcat_scholar/templates/base.html:189
 msgid "Search API"
 msgstr "Αναζήτηση API"
 
-#: fatcat_scholar/templates/base.html:189
+#: fatcat_scholar/templates/base.html:190
 msgid "Service Status"
 msgstr "Κατάσταση υπηρεσίας"
 
-#: fatcat_scholar/templates/base.html:190
+#: fatcat_scholar/templates/base.html:191
 msgid "Source Code"
 msgstr "Πηγαίος κώδικας"
 
-#: fatcat_scholar/templates/base.html:199
+#: fatcat_scholar/templates/base.html:200
 msgid "Help"
 msgstr "Βοήθεια"
 
@@ -576,6 +576,10 @@ msgid ""
 "sometimes provide additional links"
 msgstr ""
 
+#: fatcat_scholar/templates/help.html:148
+msgid "Tags"
+msgstr ""
+
 #: fatcat_scholar/templates/help.html:150
 msgid ""
 "Search results may have tag labels which provide additional context about "
@@ -640,6 +644,10 @@ msgid ""
 "\">JSTOR</a> digital preservation platform"
 msgstr ""
 
+#: fatcat_scholar/templates/help.html:198
+msgid "Persistent Identifiers"
+msgstr ""
+
 #: fatcat_scholar/templates/help.html:200
 msgid ""
 "Underneath search results, and alternate version listings, are any known "
diff --git a/fatcat_scholar/translations/es/LC_MESSAGES/messages.po b/fatcat_scholar/translations/es/LC_MESSAGES/messages.po
index b30a500..6c84435 100644
--- a/fatcat_scholar/translations/es/LC_MESSAGES/messages.po
+++ b/fatcat_scholar/translations/es/LC_MESSAGES/messages.po
@@ -9,7 +9,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: PROJECT VERSION\n"
 "Report-Msgid-Bugs-To: EMAIL@ADDRESS\n"
-"POT-Creation-Date: 2021-08-12 16:37-0700\n"
+"POT-Creation-Date: 2021-11-10 16:26-0800\n"
 "PO-Revision-Date: 2021-08-08 04:32+0000\n"
 "Last-Translator: Adolfo Jayme Barrientos <fitojb@ubuntu.com>\n"
 "Language-Team: Spanish <https://hosted.weblate.org/projects/internetarchive/"
@@ -22,83 +22,83 @@ msgstr ""
 "X-Generator: Weblate 4.8-dev\n"
 "Generated-By: Babel 2.8.0\n"
 
-#: fatcat_scholar/search.py:44
+#: fatcat_scholar/search.py:45
 msgid "Release Date"
 msgstr "Fecha de publicación"
 
-#: fatcat_scholar/search.py:48
+#: fatcat_scholar/search.py:49
 msgid "All Time"
 msgstr "Todo el tiempo"
 
-#: fatcat_scholar/search.py:49
+#: fatcat_scholar/search.py:50
 msgid "Past Week"
 msgstr "La semana pasada"
 
-#: fatcat_scholar/search.py:50
+#: fatcat_scholar/search.py:51
 msgid "Past Year"
 msgstr "El año pasado"
 
-#: fatcat_scholar/search.py:51
+#: fatcat_scholar/search.py:52
 msgid "Since 2000"
 msgstr "Desde 2000"
 
-#: fatcat_scholar/search.py:52
+#: fatcat_scholar/search.py:53
 msgid "Before 1925"
 msgstr "Antes de 1925"
 
-#: fatcat_scholar/search.py:56
+#: fatcat_scholar/search.py:57
 msgid "Resource Type"
 msgstr "Tipo de recurso"
 
-#: fatcat_scholar/search.py:60
+#: fatcat_scholar/search.py:61
 msgid "Papers"
 msgstr "Artículos"
 
-#: fatcat_scholar/search.py:61
+#: fatcat_scholar/search.py:62
 msgid "Reports"
 msgstr "Informes"
 
-#: fatcat_scholar/search.py:62
+#: fatcat_scholar/search.py:63
 msgid "Datasets"
 msgstr "Conjuntos de datos"
 
-#: fatcat_scholar/search.py:63
+#: fatcat_scholar/search.py:64
 msgid "Everything"
 msgstr "Todo"
 
-#: fatcat_scholar/search.py:67
+#: fatcat_scholar/search.py:68
 msgid "Availability"
 msgstr "Disponibilidad"
 
-#: fatcat_scholar/search.py:71
+#: fatcat_scholar/search.py:72
 msgid "Fulltext"
 msgstr "Texto completo"
 
-#: fatcat_scholar/search.py:72
+#: fatcat_scholar/search.py:73
 msgid "Microfilm"
 msgstr "Microfilm"
 
-#: fatcat_scholar/search.py:73 fatcat_scholar/templates/search_macros.html:4
+#: fatcat_scholar/search.py:74 fatcat_scholar/templates/search_macros.html:4
 msgid "Open Access"
 msgstr "Acceso abierto"
 
-#: fatcat_scholar/search.py:74
+#: fatcat_scholar/search.py:75
 msgid "Metadata"
 msgstr "Metadatos"
 
-#: fatcat_scholar/search.py:78
+#: fatcat_scholar/search.py:79
 msgid "Sort Order"
 msgstr "Orden de clasificación"
 
-#: fatcat_scholar/search.py:82
+#: fatcat_scholar/search.py:83
 msgid "Relevancy"
 msgstr "Relevancia"
 
-#: fatcat_scholar/search.py:83
+#: fatcat_scholar/search.py:84
 msgid "Recent First"
 msgstr "Recientes primero"
 
-#: fatcat_scholar/search.py:84
+#: fatcat_scholar/search.py:85
 msgid "Oldest First"
 msgstr "Los más antiguos primero"
 
@@ -121,7 +121,7 @@ msgstr ""
 "enumera algunos defectos y problemas conocidos"
 
 #: fatcat_scholar/templates/about.html:14
-#: fatcat_scholar/templates/base.html:196
+#: fatcat_scholar/templates/base.html:197
 msgid "How It Works"
 msgstr "Cómo funciona"
 
@@ -164,7 +164,7 @@ msgstr ""
 "objetivos del proyecto en general."
 
 #: fatcat_scholar/templates/about.html:27
-#: fatcat_scholar/templates/base.html:197
+#: fatcat_scholar/templates/base.html:198
 msgid "Content Sources"
 msgstr "Fuentes de contenido"
 
@@ -186,7 +186,7 @@ msgstr ""
 "duda."
 
 #: fatcat_scholar/templates/about.html:35
-#: fatcat_scholar/templates/base.html:198
+#: fatcat_scholar/templates/base.html:199
 msgid "Text and Data Mining"
 msgstr "Minería de textos y datos"
 
@@ -317,35 +317,35 @@ msgstr ""
 msgid "Fatcat catalog page"
 msgstr ""
 
-#: fatcat_scholar/templates/base.html:12
+#: fatcat_scholar/templates/base.html:13
 msgid "Internet Archive Scholar"
 msgstr "Archivo de Internet Académico"
 
-#: fatcat_scholar/templates/base.html:82
+#: fatcat_scholar/templates/base.html:83
 msgid "language selection menu"
 msgstr "Carta de selección de la lengua"
 
-#: fatcat_scholar/templates/base.html:104
+#: fatcat_scholar/templates/base.html:105
 msgid "Contribute to translations"
 msgstr "Contribuir a las traducciones"
 
-#: fatcat_scholar/templates/base.html:127
+#: fatcat_scholar/templates/base.html:128
 msgid "by title, authors, keywords..."
 msgstr "por título, autores, palabras clave..."
 
-#: fatcat_scholar/templates/base.html:127
+#: fatcat_scholar/templates/base.html:128
 msgid "search for papers"
 msgstr "buscar artículos"
 
-#: fatcat_scholar/templates/base.html:128 fatcat_scholar/templates/home.html:16
+#: fatcat_scholar/templates/base.html:129 fatcat_scholar/templates/home.html:16
 msgid "Search"
 msgstr "Buscar"
 
-#: fatcat_scholar/templates/base.html:138
+#: fatcat_scholar/templates/base.html:139
 msgid "User Guide"
 msgstr "Guía del usuario"
 
-#: fatcat_scholar/templates/base.html:166
+#: fatcat_scholar/templates/base.html:167
 msgid ""
 "We are a US 501(c)(3) non-profit library, building a global archive of "
 "Internet sites and other cultural artifacts in digital form."
@@ -354,7 +354,7 @@ msgstr ""
 "construyendo un archivo global de sitios de Internet y otros artefactos "
 "culturales en forma digital."
 
-#: fatcat_scholar/templates/base.html:168
+#: fatcat_scholar/templates/base.html:169
 #, python-format
 msgid ""
 "Other projects include %(wayback)s, %(archive_org)s, %(openlibrary)s, and "
@@ -363,47 +363,47 @@ msgstr ""
 "Otros proyectos incluyen %(wayback)s, %(archive_org)s, %(openlibrary)s y "
 "%(archive_it)s."
 
-#: fatcat_scholar/templates/base.html:175
+#: fatcat_scholar/templates/base.html:176
 msgid "About Us"
 msgstr "Sobre nosotros"
 
-#: fatcat_scholar/templates/base.html:176
+#: fatcat_scholar/templates/base.html:177
 msgid "Contact Us"
 msgstr "Contacto"
 
-#: fatcat_scholar/templates/base.html:177
+#: fatcat_scholar/templates/base.html:178
 msgid "Policies"
 msgstr "Políticas"
 
-#: fatcat_scholar/templates/base.html:178
+#: fatcat_scholar/templates/base.html:179
 msgid "Donate"
 msgstr "Donar"
 
-#: fatcat_scholar/templates/base.html:184
+#: fatcat_scholar/templates/base.html:185
 msgid "Open Infrastructure"
 msgstr "Infraestructura abierta"
 
-#: fatcat_scholar/templates/base.html:186
+#: fatcat_scholar/templates/base.html:187
 msgid "Editable Catalog (Fatcat)"
 msgstr "Catálogo editable (Fatcat)"
 
-#: fatcat_scholar/templates/base.html:187
+#: fatcat_scholar/templates/base.html:188
 msgid "Contribute"
 msgstr "Contribur"
 
-#: fatcat_scholar/templates/base.html:188
+#: fatcat_scholar/templates/base.html:189
 msgid "Search API"
 msgstr "Búsqueda API"
 
-#: fatcat_scholar/templates/base.html:189
+#: fatcat_scholar/templates/base.html:190
 msgid "Service Status"
 msgstr "Estado del servicio"
 
-#: fatcat_scholar/templates/base.html:190
+#: fatcat_scholar/templates/base.html:191
 msgid "Source Code"
 msgstr "Código fuente"
 
-#: fatcat_scholar/templates/base.html:199
+#: fatcat_scholar/templates/base.html:200
 msgid "Help"
 msgstr "Ayuda"
 
@@ -662,6 +662,10 @@ msgstr ""
 "Si el trabajo se archiva en su totalidad en una plataforma abierta y fiable, "
 "a veces proporcionaremos enlaces adicionales"
 
+#: fatcat_scholar/templates/help.html:148
+msgid "Tags"
+msgstr ""
+
 #: fatcat_scholar/templates/help.html:150
 msgid ""
 "Search results may have tag labels which provide additional context about "
@@ -752,6 +756,10 @@ msgstr ""
 "Preservado y/o alojado en la plataforma de preservación digital <a href="
 "\"https://en.wikipedia.org/wiki/JSTOR\">JSTOR</a>"
 
+#: fatcat_scholar/templates/help.html:198
+msgid "Persistent Identifiers"
+msgstr ""
+
 #: fatcat_scholar/templates/help.html:200
 msgid ""
 "Underneath search results, and alternate version listings, are any known "
diff --git a/fatcat_scholar/translations/fa/LC_MESSAGES/messages.po b/fatcat_scholar/translations/fa/LC_MESSAGES/messages.po
index 3b650d3..be1c225 100644
--- a/fatcat_scholar/translations/fa/LC_MESSAGES/messages.po
+++ b/fatcat_scholar/translations/fa/LC_MESSAGES/messages.po
@@ -7,7 +7,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: PROJECT VERSION\n"
 "Report-Msgid-Bugs-To: EMAIL@ADDRESS\n"
-"POT-Creation-Date: 2021-08-12 16:37-0700\n"
+"POT-Creation-Date: 2021-11-10 16:26-0800\n"
 "PO-Revision-Date: 2021-03-26 18:29+0000\n"
 "Last-Translator: Bryan Newbold <bnewbold@robocracy.org>\n"
 "Language-Team: Persian <https://hosted.weblate.org/projects/internetarchive/"
@@ -20,83 +20,83 @@ msgstr ""
 "X-Generator: Weblate 4.6-dev\n"
 "Generated-By: Babel 2.6.0\n"
 
-#: fatcat_scholar/search.py:44
+#: fatcat_scholar/search.py:45
 msgid "Release Date"
 msgstr "تاریخ انتشار"
 
-#: fatcat_scholar/search.py:48
+#: fatcat_scholar/search.py:49
 msgid "All Time"
 msgstr "همیشه"
 
-#: fatcat_scholar/search.py:49
+#: fatcat_scholar/search.py:50
 msgid "Past Week"
 msgstr "هفته گذشته"
 
-#: fatcat_scholar/search.py:50
+#: fatcat_scholar/search.py:51
 msgid "Past Year"
 msgstr "سال گذشته"
 
-#: fatcat_scholar/search.py:51
+#: fatcat_scholar/search.py:52
 msgid "Since 2000"
 msgstr "از سال 2000"
 
-#: fatcat_scholar/search.py:52
+#: fatcat_scholar/search.py:53
 msgid "Before 1925"
 msgstr "قبل از سال 1925"
 
-#: fatcat_scholar/search.py:56
+#: fatcat_scholar/search.py:57
 msgid "Resource Type"
 msgstr "نوع منبع"
 
-#: fatcat_scholar/search.py:60
+#: fatcat_scholar/search.py:61
 msgid "Papers"
 msgstr "اوراق"
 
-#: fatcat_scholar/search.py:61
+#: fatcat_scholar/search.py:62
 msgid "Reports"
 msgstr "گزارش ها"
 
-#: fatcat_scholar/search.py:62
+#: fatcat_scholar/search.py:63
 msgid "Datasets"
 msgstr "مجموعه داده ها"
 
-#: fatcat_scholar/search.py:63
+#: fatcat_scholar/search.py:64
 msgid "Everything"
 msgstr "همه چیز"
 
-#: fatcat_scholar/search.py:67
+#: fatcat_scholar/search.py:68
 msgid "Availability"
 msgstr "دسترس پذیری"
 
-#: fatcat_scholar/search.py:71
+#: fatcat_scholar/search.py:72
 msgid "Fulltext"
 msgstr "كاملا متن"
 
-#: fatcat_scholar/search.py:72
+#: fatcat_scholar/search.py:73
 msgid "Microfilm"
 msgstr "میکروفیلم"
 
-#: fatcat_scholar/search.py:73 fatcat_scholar/templates/search_macros.html:4
+#: fatcat_scholar/search.py:74 fatcat_scholar/templates/search_macros.html:4
 msgid "Open Access"
 msgstr "دسترسی آزاد"
 
-#: fatcat_scholar/search.py:74
+#: fatcat_scholar/search.py:75
 msgid "Metadata"
 msgstr "Metadata"
 
-#: fatcat_scholar/search.py:78
+#: fatcat_scholar/search.py:79
 msgid "Sort Order"
 msgstr "ترتیب چینش"
 
-#: fatcat_scholar/search.py:82
+#: fatcat_scholar/search.py:83
 msgid "Relevancy"
 msgstr "ربط"
 
-#: fatcat_scholar/search.py:83
+#: fatcat_scholar/search.py:84
 msgid "Recent First"
 msgstr "اول اخیر"
 
-#: fatcat_scholar/search.py:84
+#: fatcat_scholar/search.py:85
 msgid "Oldest First"
 msgstr "قدیمی‌تر بودن"
 
@@ -119,7 +119,7 @@ msgstr ""
 "اشکالات و مشکلات شناخته شده را فهرست می کند ، مراجعه کنید"
 
 #: fatcat_scholar/templates/about.html:14
-#: fatcat_scholar/templates/base.html:196
+#: fatcat_scholar/templates/base.html:197
 msgid "How It Works"
 msgstr "نحوه کار"
 
@@ -159,7 +159,7 @@ msgstr ""
 "فنی و اهداف پروژه را ارائه می دهد."
 
 #: fatcat_scholar/templates/about.html:27
-#: fatcat_scholar/templates/base.html:197
+#: fatcat_scholar/templates/base.html:198
 msgid "Content Sources"
 msgstr "منابع محتوا"
 
@@ -177,7 +177,7 @@ msgstr ""
 "<a href=\"#contact\"> اگر سوالی دارید با ما تماس بگیرید </a>."
 
 #: fatcat_scholar/templates/about.html:35
-#: fatcat_scholar/templates/base.html:198
+#: fatcat_scholar/templates/base.html:199
 msgid "Text and Data Mining"
 msgstr "متن و داده کاوی"
 
@@ -308,35 +308,35 @@ msgstr ""
 msgid "Fatcat catalog page"
 msgstr ""
 
-#: fatcat_scholar/templates/base.html:12
+#: fatcat_scholar/templates/base.html:13
 msgid "Internet Archive Scholar"
 msgstr "پژوهشگر بایگانی اینترنتی"
 
-#: fatcat_scholar/templates/base.html:82
+#: fatcat_scholar/templates/base.html:83
 msgid "language selection menu"
 msgstr "منوی انتخاب زبان"
 
-#: fatcat_scholar/templates/base.html:104
+#: fatcat_scholar/templates/base.html:105
 msgid "Contribute to translations"
 msgstr "به ترجمه کمک کنید"
 
-#: fatcat_scholar/templates/base.html:127
+#: fatcat_scholar/templates/base.html:128
 msgid "by title, authors, keywords..."
 msgstr "با عنوان ، نویسندگان ، کلمات کلیدی ..."
 
-#: fatcat_scholar/templates/base.html:127
+#: fatcat_scholar/templates/base.html:128
 msgid "search for papers"
 msgstr "جستجوی مقالات"
 
-#: fatcat_scholar/templates/base.html:128 fatcat_scholar/templates/home.html:16
+#: fatcat_scholar/templates/base.html:129 fatcat_scholar/templates/home.html:16
 msgid "Search"
 msgstr "جستجو"
 
-#: fatcat_scholar/templates/base.html:138
+#: fatcat_scholar/templates/base.html:139
 msgid "User Guide"
 msgstr "راهنمای کاربر"
 
-#: fatcat_scholar/templates/base.html:166
+#: fatcat_scholar/templates/base.html:167
 msgid ""
 "We are a US 501(c)(3) non-profit library, building a global archive of "
 "Internet sites and other cultural artifacts in digital form."
@@ -344,7 +344,7 @@ msgstr ""
 "ما یک کتابخانه غیرانتفاعی 501 (c) (3) ایالات متحده هستیم که یک آرشیو جهانی "
 "از سایت های اینترنتی و سایر آثار فرهنگی را به صورت دیجیتال ایجاد می کنیم."
 
-#: fatcat_scholar/templates/base.html:168
+#: fatcat_scholar/templates/base.html:169
 #, python-format
 msgid ""
 "Other projects include %(wayback)s, %(archive_org)s, %(openlibrary)s, and "
@@ -353,47 +353,47 @@ msgstr ""
 "سایر پروژه ها شامل %(wayback)s ، %(archive_org)s ، %(openlibrary)s و "
 "%(archive_it)s است."
 
-#: fatcat_scholar/templates/base.html:175
+#: fatcat_scholar/templates/base.html:176
 msgid "About Us"
 msgstr "درباره ما"
 
-#: fatcat_scholar/templates/base.html:176
+#: fatcat_scholar/templates/base.html:177
 msgid "Contact Us"
 msgstr "ارتباط با ما"
 
-#: fatcat_scholar/templates/base.html:177
+#: fatcat_scholar/templates/base.html:178
 msgid "Policies"
 msgstr "سیاست های"
 
-#: fatcat_scholar/templates/base.html:178
+#: fatcat_scholar/templates/base.html:179
 msgid "Donate"
 msgstr "اهدا کنید"
 
-#: fatcat_scholar/templates/base.html:184
+#: fatcat_scholar/templates/base.html:185
 msgid "Open Infrastructure"
 msgstr "زیرساخت باز"
 
-#: fatcat_scholar/templates/base.html:186
+#: fatcat_scholar/templates/base.html:187
 msgid "Editable Catalog (Fatcat)"
 msgstr "کاتالوگ قابل ویرایش (Fatcat)"
 
-#: fatcat_scholar/templates/base.html:187
+#: fatcat_scholar/templates/base.html:188
 msgid "Contribute"
 msgstr "مشارکت"
 
-#: fatcat_scholar/templates/base.html:188
+#: fatcat_scholar/templates/base.html:189
 msgid "Search API"
 msgstr "API را جستجو کنید"
 
-#: fatcat_scholar/templates/base.html:189
+#: fatcat_scholar/templates/base.html:190
 msgid "Service Status"
 msgstr "وضعیت سرویس"
 
-#: fatcat_scholar/templates/base.html:190
+#: fatcat_scholar/templates/base.html:191
 msgid "Source Code"
 msgstr "کد منبع"
 
-#: fatcat_scholar/templates/base.html:199
+#: fatcat_scholar/templates/base.html:200
 msgid "Help"
 msgstr "راهنمایی"
 
@@ -643,6 +643,10 @@ msgstr ""
 "اگر کار به صورت کامل در یک بستر قابل اعتماد و باز بایگانی شود ، گاهی اوقات "
 "پیوندهای اضافی ارائه می دهیم"
 
+#: fatcat_scholar/templates/help.html:148
+msgid "Tags"
+msgstr ""
+
 #: fatcat_scholar/templates/help.html:150
 msgid ""
 "Search results may have tag labels which provide additional context about "
@@ -731,6 +735,10 @@ msgstr ""
 "در پلتفرم حفاظت دیجیتال <a href=\"https://en.wikipedia.org/wiki/JSTOR\"> "
 "JSTOR </a> حفظ و یا میزبانی می شود"
 
+#: fatcat_scholar/templates/help.html:198
+msgid "Persistent Identifiers"
+msgstr ""
+
 #: fatcat_scholar/templates/help.html:200
 msgid ""
 "Underneath search results, and alternate version listings, are any known "
diff --git a/fatcat_scholar/translations/fr/LC_MESSAGES/messages.po b/fatcat_scholar/translations/fr/LC_MESSAGES/messages.po
index 35bcd36..bd0e93a 100644
--- a/fatcat_scholar/translations/fr/LC_MESSAGES/messages.po
+++ b/fatcat_scholar/translations/fr/LC_MESSAGES/messages.po
@@ -10,7 +10,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: PROJECT VERSION\n"
 "Report-Msgid-Bugs-To: EMAIL@ADDRESS\n"
-"POT-Creation-Date: 2021-08-12 16:37-0700\n"
+"POT-Creation-Date: 2021-11-10 16:26-0800\n"
 "PO-Revision-Date: 2021-04-13 00:26+0000\n"
 "Last-Translator: J. Lavoie <j.lavoie@net-c.ca>\n"
 "Language-Team: French <https://hosted.weblate.org/projects/internetarchive/"
@@ -23,83 +23,83 @@ msgstr ""
 "X-Generator: Weblate 4.6-dev\n"
 "Generated-By: Babel 2.8.0\n"
 
-#: fatcat_scholar/search.py:44
+#: fatcat_scholar/search.py:45
 msgid "Release Date"
 msgstr "Date de version"
 
-#: fatcat_scholar/search.py:48
+#: fatcat_scholar/search.py:49
 msgid "All Time"
 msgstr "N'importe quelle date"
 
-#: fatcat_scholar/search.py:49
+#: fatcat_scholar/search.py:50
 msgid "Past Week"
 msgstr "La semaine dernière"
 
-#: fatcat_scholar/search.py:50
+#: fatcat_scholar/search.py:51
 msgid "Past Year"
 msgstr "L'année passée"
 
-#: fatcat_scholar/search.py:51
+#: fatcat_scholar/search.py:52
 msgid "Since 2000"
 msgstr "Depuis 2000"
 
-#: fatcat_scholar/search.py:52
+#: fatcat_scholar/search.py:53
 msgid "Before 1925"
 msgstr "Avant 1925"
 
-#: fatcat_scholar/search.py:56
+#: fatcat_scholar/search.py:57
 msgid "Resource Type"
 msgstr "Type de ressource"
 
-#: fatcat_scholar/search.py:60
+#: fatcat_scholar/search.py:61
 msgid "Papers"
 msgstr "Publications"
 
-#: fatcat_scholar/search.py:61
+#: fatcat_scholar/search.py:62
 msgid "Reports"
 msgstr "Rapports"
 
-#: fatcat_scholar/search.py:62
+#: fatcat_scholar/search.py:63
 msgid "Datasets"
 msgstr "Ensembles de données"
 
-#: fatcat_scholar/search.py:63
+#: fatcat_scholar/search.py:64
 msgid "Everything"
 msgstr "Tout"
 
-#: fatcat_scholar/search.py:67
+#: fatcat_scholar/search.py:68
 msgid "Availability"
 msgstr "Disponibilité"
 
-#: fatcat_scholar/search.py:71
+#: fatcat_scholar/search.py:72
 msgid "Fulltext"
 msgstr "Texte entier"
 
-#: fatcat_scholar/search.py:72
+#: fatcat_scholar/search.py:73
 msgid "Microfilm"
 msgstr "Microfilm"
 
-#: fatcat_scholar/search.py:73 fatcat_scholar/templates/search_macros.html:4
+#: fatcat_scholar/search.py:74 fatcat_scholar/templates/search_macros.html:4
 msgid "Open Access"
 msgstr "Accès libre"
 
-#: fatcat_scholar/search.py:74
+#: fatcat_scholar/search.py:75
 msgid "Metadata"
 msgstr "Métadonnées"
 
-#: fatcat_scholar/search.py:78
+#: fatcat_scholar/search.py:79
 msgid "Sort Order"
 msgstr "Ordre de tri"
 
-#: fatcat_scholar/search.py:82
+#: fatcat_scholar/search.py:83
 msgid "Relevancy"
 msgstr "Pertinence"
 
-#: fatcat_scholar/search.py:83
+#: fatcat_scholar/search.py:84
 msgid "Recent First"
 msgstr "Récent en premier"
 
-#: fatcat_scholar/search.py:84
+#: fatcat_scholar/search.py:85
 msgid "Oldest First"
 msgstr "Plus ancien en premier"
 
@@ -122,7 +122,7 @@ msgstr ""
 "liste certains bogues et problèmes connus"
 
 #: fatcat_scholar/templates/about.html:14
-#: fatcat_scholar/templates/base.html:196
+#: fatcat_scholar/templates/base.html:197
 msgid "How It Works"
 msgstr "Comment ça marche"
 
@@ -168,7 +168,7 @@ msgstr ""
 "dans son ensemble."
 
 #: fatcat_scholar/templates/about.html:27
-#: fatcat_scholar/templates/base.html:197
+#: fatcat_scholar/templates/base.html:198
 msgid "Content Sources"
 msgstr "Sources de contenu"
 
@@ -189,7 +189,7 @@ msgstr ""
 "<a href=\"#contact\">contactez-nous</a> si vous avez des questions."
 
 #: fatcat_scholar/templates/about.html:35
-#: fatcat_scholar/templates/base.html:198
+#: fatcat_scholar/templates/base.html:199
 msgid "Text and Data Mining"
 msgstr "Exploration de texte et de données"
 
@@ -327,35 +327,35 @@ msgstr "accès à la page d'accueil fatcat"
 msgid "Fatcat catalog page"
 msgstr "accès à la page d'accueil fatcat"
 
-#: fatcat_scholar/templates/base.html:12
+#: fatcat_scholar/templates/base.html:13
 msgid "Internet Archive Scholar"
 msgstr "Internet Archive Scholar"
 
-#: fatcat_scholar/templates/base.html:82
+#: fatcat_scholar/templates/base.html:83
 msgid "language selection menu"
 msgstr "menu de sélection de la langue"
 
-#: fatcat_scholar/templates/base.html:104
+#: fatcat_scholar/templates/base.html:105
 msgid "Contribute to translations"
 msgstr "Contribuer aux traductions"
 
-#: fatcat_scholar/templates/base.html:127
+#: fatcat_scholar/templates/base.html:128
 msgid "by title, authors, keywords..."
 msgstr "par titre, auteurs, mots-clés…"
 
-#: fatcat_scholar/templates/base.html:127
+#: fatcat_scholar/templates/base.html:128
 msgid "search for papers"
 msgstr "rechercher des publications"
 
-#: fatcat_scholar/templates/base.html:128 fatcat_scholar/templates/home.html:16
+#: fatcat_scholar/templates/base.html:129 fatcat_scholar/templates/home.html:16
 msgid "Search"
 msgstr "Recherche"
 
-#: fatcat_scholar/templates/base.html:138
+#: fatcat_scholar/templates/base.html:139
 msgid "User Guide"
 msgstr "Guide d’utilisation"
 
-#: fatcat_scholar/templates/base.html:166
+#: fatcat_scholar/templates/base.html:167
 msgid ""
 "We are a US 501(c)(3) non-profit library, building a global archive of "
 "Internet sites and other cultural artifacts in digital form."
@@ -364,7 +364,7 @@ msgstr ""
 "construisant une archive mondiale de sites Internet et d'autres objets "
 "culturels sous forme numérique."
 
-#: fatcat_scholar/templates/base.html:168
+#: fatcat_scholar/templates/base.html:169
 #, python-format
 msgid ""
 "Other projects include %(wayback)s, %(archive_org)s, %(openlibrary)s, and "
@@ -373,47 +373,47 @@ msgstr ""
 "D'autres projets comprennent %(wayback)s, %(archive_org)s, %(openlibrary)s "
 "et %(archive_it)s."
 
-#: fatcat_scholar/templates/base.html:175
+#: fatcat_scholar/templates/base.html:176
 msgid "About Us"
 msgstr "À propos de nous"
 
-#: fatcat_scholar/templates/base.html:176
+#: fatcat_scholar/templates/base.html:177
 msgid "Contact Us"
 msgstr "Nous contacter"
 
-#: fatcat_scholar/templates/base.html:177
+#: fatcat_scholar/templates/base.html:178
 msgid "Policies"
 msgstr "Politiques"
 
-#: fatcat_scholar/templates/base.html:178
+#: fatcat_scholar/templates/base.html:179
 msgid "Donate"
 msgstr "Faire un don"
 
-#: fatcat_scholar/templates/base.html:184
+#: fatcat_scholar/templates/base.html:185
 msgid "Open Infrastructure"
 msgstr "Infrastructure ouverte"
 
-#: fatcat_scholar/templates/base.html:186
+#: fatcat_scholar/templates/base.html:187
 msgid "Editable Catalog (Fatcat)"
 msgstr "Catalogue modifiable (Fatcat)"
 
-#: fatcat_scholar/templates/base.html:187
+#: fatcat_scholar/templates/base.html:188
 msgid "Contribute"
 msgstr "Contribuer"
 
-#: fatcat_scholar/templates/base.html:188
+#: fatcat_scholar/templates/base.html:189
 msgid "Search API"
 msgstr "API de recherche"
 
-#: fatcat_scholar/templates/base.html:189
+#: fatcat_scholar/templates/base.html:190
 msgid "Service Status"
 msgstr "État des services"
 
-#: fatcat_scholar/templates/base.html:190
+#: fatcat_scholar/templates/base.html:191
 msgid "Source Code"
 msgstr "Code source"
 
-#: fatcat_scholar/templates/base.html:199
+#: fatcat_scholar/templates/base.html:200
 msgid "Help"
 msgstr "Aide"
 
@@ -674,6 +674,10 @@ msgstr ""
 "Si l'œuvre est archivée intégralement sur une plateforme fiable et ouverte, "
 "nous fournirons parfois des liens supplémentaires"
 
+#: fatcat_scholar/templates/help.html:148
+msgid "Tags"
+msgstr ""
+
 #: fatcat_scholar/templates/help.html:150
 msgid ""
 "Search results may have tag labels which provide additional context about "
@@ -764,6 +768,10 @@ msgstr ""
 "Préservé et/ou hébergé sur la plateforme de préservation numérique <a href="
 "\"https://en.wikipedia.org/wiki/JSTOR\">JSTOR</a>"
 
+#: fatcat_scholar/templates/help.html:198
+msgid "Persistent Identifiers"
+msgstr ""
+
 #: fatcat_scholar/templates/help.html:200
 msgid ""
 "Underneath search results, and alternate version listings, are any known "
diff --git a/fatcat_scholar/translations/hr/LC_MESSAGES/messages.po b/fatcat_scholar/translations/hr/LC_MESSAGES/messages.po
index 479bf90..826bb19 100644
--- a/fatcat_scholar/translations/hr/LC_MESSAGES/messages.po
+++ b/fatcat_scholar/translations/hr/LC_MESSAGES/messages.po
@@ -7,8 +7,8 @@
 msgid ""
 msgstr ""
 "Project-Id-Version: PROJECT VERSION\n"
-"Report-Msgid-Bugs-To: bnewbold@archive.org\n"
-"POT-Creation-Date: 2021-08-12 16:37-0700\n"
+"Report-Msgid-Bugs-To: EMAIL@ADDRESS\n"
+"POT-Creation-Date: 2021-11-10 16:26-0800\n"
 "PO-Revision-Date: 2021-11-11 00:30+0000\n"
 "Last-Translator: Milo Ivir <mail@milotype.de>\n"
 "Language-Team: Croatian <https://hosted.weblate.org/projects/internetarchive/"
@@ -22,83 +22,83 @@ msgstr ""
 "X-Generator: Weblate 4.9.1-dev\n"
 "Generated-By: Babel 2.8.0\n"
 
-#: fatcat_scholar/search.py:44
+#: fatcat_scholar/search.py:45
 msgid "Release Date"
 msgstr "Datum objave"
 
-#: fatcat_scholar/search.py:48
+#: fatcat_scholar/search.py:49
 msgid "All Time"
 msgstr "Svo vrijeme"
 
-#: fatcat_scholar/search.py:49
+#: fatcat_scholar/search.py:50
 msgid "Past Week"
 msgstr "Prošli tjedan"
 
-#: fatcat_scholar/search.py:50
+#: fatcat_scholar/search.py:51
 msgid "Past Year"
 msgstr "Prošla godina"
 
-#: fatcat_scholar/search.py:51
+#: fatcat_scholar/search.py:52
 msgid "Since 2000"
 msgstr "Nakon 2000."
 
-#: fatcat_scholar/search.py:52
+#: fatcat_scholar/search.py:53
 msgid "Before 1925"
 msgstr "Prije 1925."
 
-#: fatcat_scholar/search.py:56
+#: fatcat_scholar/search.py:57
 msgid "Resource Type"
 msgstr "Vrsta građe"
 
-#: fatcat_scholar/search.py:60
+#: fatcat_scholar/search.py:61
 msgid "Papers"
 msgstr "Članci"
 
-#: fatcat_scholar/search.py:61
+#: fatcat_scholar/search.py:62
 msgid "Reports"
 msgstr "Izvještaji"
 
-#: fatcat_scholar/search.py:62
+#: fatcat_scholar/search.py:63
 msgid "Datasets"
 msgstr "Skupovi podataka"
 
-#: fatcat_scholar/search.py:63
+#: fatcat_scholar/search.py:64
 msgid "Everything"
 msgstr "Sve"
 
-#: fatcat_scholar/search.py:67
+#: fatcat_scholar/search.py:68
 msgid "Availability"
 msgstr "Dostupnost"
 
-#: fatcat_scholar/search.py:71
+#: fatcat_scholar/search.py:72
 msgid "Fulltext"
 msgstr "Tekst"
 
-#: fatcat_scholar/search.py:72
+#: fatcat_scholar/search.py:73
 msgid "Microfilm"
 msgstr "Mikrofilm"
 
-#: fatcat_scholar/search.py:73 fatcat_scholar/templates/search_macros.html:4
+#: fatcat_scholar/search.py:74 fatcat_scholar/templates/search_macros.html:4
 msgid "Open Access"
 msgstr "Slobodan pristup"
 
-#: fatcat_scholar/search.py:74
+#: fatcat_scholar/search.py:75
 msgid "Metadata"
 msgstr "Metapodaci"
 
-#: fatcat_scholar/search.py:78
+#: fatcat_scholar/search.py:79
 msgid "Sort Order"
 msgstr "Redoslijed"
 
-#: fatcat_scholar/search.py:82
+#: fatcat_scholar/search.py:83
 msgid "Relevancy"
 msgstr "Relevantnost"
 
-#: fatcat_scholar/search.py:83
+#: fatcat_scholar/search.py:84
 msgid "Recent First"
 msgstr "Najprije najnovije"
 
-#: fatcat_scholar/search.py:84
+#: fatcat_scholar/search.py:85
 msgid "Oldest First"
 msgstr "Najprije najstarije"
 
@@ -121,7 +121,7 @@ msgstr ""
 "koji navodi greške i poznate probleme"
 
 #: fatcat_scholar/templates/about.html:14
-#: fatcat_scholar/templates/base.html:196
+#: fatcat_scholar/templates/base.html:197
 msgid "How It Works"
 msgstr "Način rada"
 
@@ -162,7 +162,7 @@ msgstr ""
 "pregled tehničke infrastrukture i sveopćih ciljeva projekta."
 
 #: fatcat_scholar/templates/about.html:27
-#: fatcat_scholar/templates/base.html:197
+#: fatcat_scholar/templates/base.html:198
 msgid "Content Sources"
 msgstr "Izvori sadržaja"
 
@@ -183,7 +183,7 @@ msgstr ""
 "ako imaš pitanja."
 
 #: fatcat_scholar/templates/about.html:35
-#: fatcat_scholar/templates/base.html:198
+#: fatcat_scholar/templates/base.html:199
 msgid "Text and Data Mining"
 msgstr "Analiziranje tekstova i podataka"
 
@@ -269,8 +269,8 @@ msgstr ""
 "Rad na Internet Archive Scholar dobio je podršku od Zaklade Andrew W. Mellon "
 "u više faza projekta <a href=\"%(grant_url)s\"> \"Ensuring the Persistent "
 "Access of Open Access Journal Literature\"</a> (Osiguravanje trajnog "
-"pristupa literaturi časopisa otvorenog pristupa) (pogledaj <a href=\""
-"%(blog_url)s\">izvornu najavu</a>).\n"
+"pristupa literaturi časopisa otvorenog pristupa) (pogledaj <a href="
+"\"%(blog_url)s\">izvornu najavu</a>).\n"
 
 #: fatcat_scholar/templates/about.html:64
 #, python-format
@@ -306,8 +306,8 @@ msgid ""
 "Some places you can visit try to hunt down this resource (or a replacement) "
 "include:"
 msgstr ""
-"Neka mjesta koja možeš posjetiti pokušavaju pronaći ovaj resurs (ili zamjenu)"
-" uključuju:"
+"Neka mjesta koja možeš posjetiti pokušavaju pronaći ovaj resurs (ili "
+"zamjenu) uključuju:"
 
 #: fatcat_scholar/templates/access_404.html:16
 msgid "Original web url:"
@@ -329,35 +329,35 @@ msgstr "Početna Scholar stranica"
 msgid "Fatcat catalog page"
 msgstr "Stranica Fatcat kataloga"
 
-#: fatcat_scholar/templates/base.html:12
+#: fatcat_scholar/templates/base.html:13
 msgid "Internet Archive Scholar"
 msgstr "Internet Archive Scholar"
 
-#: fatcat_scholar/templates/base.html:82
+#: fatcat_scholar/templates/base.html:83
 msgid "language selection menu"
 msgstr "izbornik jezika"
 
-#: fatcat_scholar/templates/base.html:104
+#: fatcat_scholar/templates/base.html:105
 msgid "Contribute to translations"
 msgstr "Doprinesi prijevodima"
 
-#: fatcat_scholar/templates/base.html:127
+#: fatcat_scholar/templates/base.html:128
 msgid "by title, authors, keywords..."
 msgstr "po naslovu, autorima, ključnim riječima …"
 
-#: fatcat_scholar/templates/base.html:127
+#: fatcat_scholar/templates/base.html:128
 msgid "search for papers"
 msgstr "traži članke"
 
-#: fatcat_scholar/templates/base.html:128 fatcat_scholar/templates/home.html:16
+#: fatcat_scholar/templates/base.html:129 fatcat_scholar/templates/home.html:16
 msgid "Search"
 msgstr "Traži"
 
-#: fatcat_scholar/templates/base.html:138
+#: fatcat_scholar/templates/base.html:139
 msgid "User Guide"
 msgstr "Korisnički priručnik"
 
-#: fatcat_scholar/templates/base.html:166
+#: fatcat_scholar/templates/base.html:167
 msgid ""
 "We are a US 501(c)(3) non-profit library, building a global archive of "
 "Internet sites and other cultural artifacts in digital form."
@@ -365,7 +365,7 @@ msgstr ""
 "Mi smo američka neprofitna knjižnica (501(c)(3)). Gradimo globalni arhiv "
 "internetskih stranica i druge kulturne građe u digitalnom obliku."
 
-#: fatcat_scholar/templates/base.html:168
+#: fatcat_scholar/templates/base.html:169
 #, python-format
 msgid ""
 "Other projects include %(wayback)s, %(archive_org)s, %(openlibrary)s, and "
@@ -374,47 +374,47 @@ msgstr ""
 "Drugi projekti uključuju %(wayback)s, %(archive_org)s, %(openlibrary)s i "
 "%(archive_it)s."
 
-#: fatcat_scholar/templates/base.html:175
+#: fatcat_scholar/templates/base.html:176
 msgid "About Us"
 msgstr "O nama"
 
-#: fatcat_scholar/templates/base.html:176
+#: fatcat_scholar/templates/base.html:177
 msgid "Contact Us"
 msgstr "Kontakt"
 
-#: fatcat_scholar/templates/base.html:177
+#: fatcat_scholar/templates/base.html:178
 msgid "Policies"
 msgstr "Pravila"
 
-#: fatcat_scholar/templates/base.html:178
+#: fatcat_scholar/templates/base.html:179
 msgid "Donate"
 msgstr "Donacije"
 
-#: fatcat_scholar/templates/base.html:184
+#: fatcat_scholar/templates/base.html:185
 msgid "Open Infrastructure"
 msgstr "Otvorena infrastruktura"
 
-#: fatcat_scholar/templates/base.html:186
+#: fatcat_scholar/templates/base.html:187
 msgid "Editable Catalog (Fatcat)"
 msgstr "Urediv katalog (Fatcat)"
 
-#: fatcat_scholar/templates/base.html:187
+#: fatcat_scholar/templates/base.html:188
 msgid "Contribute"
 msgstr "Doprinesi"
 
-#: fatcat_scholar/templates/base.html:188
+#: fatcat_scholar/templates/base.html:189
 msgid "Search API"
 msgstr "API pretrage"
 
-#: fatcat_scholar/templates/base.html:189
+#: fatcat_scholar/templates/base.html:190
 msgid "Service Status"
 msgstr "Stanje usluge"
 
-#: fatcat_scholar/templates/base.html:190
+#: fatcat_scholar/templates/base.html:191
 msgid "Source Code"
 msgstr "Izvorni kȏd"
 
-#: fatcat_scholar/templates/base.html:199
+#: fatcat_scholar/templates/base.html:200
 msgid "Help"
 msgstr "Pomoć"
 
@@ -664,6 +664,10 @@ msgstr ""
 "Ako je rad u cijelosti arhiviran na pouzdanoj, otvorenoj platformi, ponekad "
 "ćemo pružiti dodatne poveznice"
 
+#: fatcat_scholar/templates/help.html:148
+msgid "Tags"
+msgstr ""
+
 #: fatcat_scholar/templates/help.html:150
 msgid ""
 "Search results may have tag labels which provide additional context about "
@@ -752,6 +756,10 @@ msgstr ""
 "Čuvanje i/ili hosting na <a href=\"https://en.wikipedia.org/wiki/JSTOR"
 "\">JSTOR</a> platformi za čuvanje digitalne građe"
 
+#: fatcat_scholar/templates/help.html:198
+msgid "Persistent Identifiers"
+msgstr ""
+
 #: fatcat_scholar/templates/help.html:200
 msgid ""
 "Underneath search results, and alternate version listings, are any known "
diff --git a/fatcat_scholar/translations/it/LC_MESSAGES/messages.po b/fatcat_scholar/translations/it/LC_MESSAGES/messages.po
index 5f02275..3fc3da3 100644
--- a/fatcat_scholar/translations/it/LC_MESSAGES/messages.po
+++ b/fatcat_scholar/translations/it/LC_MESSAGES/messages.po
@@ -11,7 +11,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: PROJECT VERSION\n"
 "Report-Msgid-Bugs-To: EMAIL@ADDRESS\n"
-"POT-Creation-Date: 2021-08-12 16:37-0700\n"
+"POT-Creation-Date: 2021-11-10 16:26-0800\n"
 "PO-Revision-Date: 2021-09-27 14:50+0000\n"
 "Last-Translator: Mauro Piccotti <mauro.piccotti@gmail.com>\n"
 "Language-Team: Italian <https://hosted.weblate.org/projects/internetarchive/"
@@ -24,83 +24,83 @@ msgstr ""
 "X-Generator: Weblate 4.9-dev\n"
 "Generated-By: Babel 2.6.0\n"
 
-#: fatcat_scholar/search.py:44
+#: fatcat_scholar/search.py:45
 msgid "Release Date"
 msgstr "Data di uscita"
 
-#: fatcat_scholar/search.py:48
+#: fatcat_scholar/search.py:49
 msgid "All Time"
 msgstr "Tutte le date"
 
-#: fatcat_scholar/search.py:49
+#: fatcat_scholar/search.py:50
 msgid "Past Week"
 msgstr "La scorsa settimana"
 
-#: fatcat_scholar/search.py:50
+#: fatcat_scholar/search.py:51
 msgid "Past Year"
 msgstr "Lo scorso anno"
 
-#: fatcat_scholar/search.py:51
+#: fatcat_scholar/search.py:52
 msgid "Since 2000"
 msgstr "Dal 2000"
 
-#: fatcat_scholar/search.py:52
+#: fatcat_scholar/search.py:53
 msgid "Before 1925"
 msgstr "Prima del 1925"
 
-#: fatcat_scholar/search.py:56
+#: fatcat_scholar/search.py:57
 msgid "Resource Type"
 msgstr "Tipo di risorsa"
 
-#: fatcat_scholar/search.py:60
+#: fatcat_scholar/search.py:61
 msgid "Papers"
 msgstr "Pubblicazioni"
 
-#: fatcat_scholar/search.py:61
+#: fatcat_scholar/search.py:62
 msgid "Reports"
 msgstr "Rapporti"
 
-#: fatcat_scholar/search.py:62
+#: fatcat_scholar/search.py:63
 msgid "Datasets"
 msgstr "Set di dati"
 
-#: fatcat_scholar/search.py:63
+#: fatcat_scholar/search.py:64
 msgid "Everything"
 msgstr "Tutto"
 
-#: fatcat_scholar/search.py:67
+#: fatcat_scholar/search.py:68
 msgid "Availability"
 msgstr "Disponibilità"
 
-#: fatcat_scholar/search.py:71
+#: fatcat_scholar/search.py:72
 msgid "Fulltext"
 msgstr "Testo completo"
 
-#: fatcat_scholar/search.py:72
+#: fatcat_scholar/search.py:73
 msgid "Microfilm"
 msgstr "Microfilm"
 
-#: fatcat_scholar/search.py:73 fatcat_scholar/templates/search_macros.html:4
+#: fatcat_scholar/search.py:74 fatcat_scholar/templates/search_macros.html:4
 msgid "Open Access"
 msgstr "Accesso aperto"
 
-#: fatcat_scholar/search.py:74
+#: fatcat_scholar/search.py:75
 msgid "Metadata"
 msgstr "Metadati"
 
-#: fatcat_scholar/search.py:78
+#: fatcat_scholar/search.py:79
 msgid "Sort Order"
 msgstr "Ordina per"
 
-#: fatcat_scholar/search.py:82
+#: fatcat_scholar/search.py:83
 msgid "Relevancy"
 msgstr "Rilevanza"
 
-#: fatcat_scholar/search.py:83
+#: fatcat_scholar/search.py:84
 msgid "Recent First"
 msgstr "Recenti"
 
-#: fatcat_scholar/search.py:84
+#: fatcat_scholar/search.py:85
 msgid "Oldest First"
 msgstr "Più vecchi"
 
@@ -123,7 +123,7 @@ msgstr ""
 "alcuni bug e problemi noti"
 
 #: fatcat_scholar/templates/about.html:14
-#: fatcat_scholar/templates/base.html:196
+#: fatcat_scholar/templates/base.html:197
 msgid "How It Works"
 msgstr "Come funziona"
 
@@ -165,7 +165,7 @@ msgstr ""
 "progetto nel suo complesso."
 
 #: fatcat_scholar/templates/about.html:27
-#: fatcat_scholar/templates/base.html:197
+#: fatcat_scholar/templates/base.html:198
 msgid "Content Sources"
 msgstr "Fonti bibliografiche"
 
@@ -186,7 +186,7 @@ msgstr ""
 "<a href=\"#contact\"> contattaci </a> se hai domande."
 
 #: fatcat_scholar/templates/about.html:35
-#: fatcat_scholar/templates/base.html:198
+#: fatcat_scholar/templates/base.html:199
 msgid "Text and Data Mining"
 msgstr "Testi e Data Mining"
 
@@ -317,35 +317,35 @@ msgstr ""
 msgid "Fatcat catalog page"
 msgstr ""
 
-#: fatcat_scholar/templates/base.html:12
+#: fatcat_scholar/templates/base.html:13
 msgid "Internet Archive Scholar"
 msgstr "Internet Archive Scholar"
 
-#: fatcat_scholar/templates/base.html:82
+#: fatcat_scholar/templates/base.html:83
 msgid "language selection menu"
 msgstr "menu di selezione della lingua"
 
-#: fatcat_scholar/templates/base.html:104
+#: fatcat_scholar/templates/base.html:105
 msgid "Contribute to translations"
 msgstr "Contribuire alle traduzioni"
 
-#: fatcat_scholar/templates/base.html:127
+#: fatcat_scholar/templates/base.html:128
 msgid "by title, authors, keywords..."
 msgstr "per titolo, autore, parole chiave..."
 
-#: fatcat_scholar/templates/base.html:127
+#: fatcat_scholar/templates/base.html:128
 msgid "search for papers"
 msgstr "ricerca di documenti"
 
-#: fatcat_scholar/templates/base.html:128 fatcat_scholar/templates/home.html:16
+#: fatcat_scholar/templates/base.html:129 fatcat_scholar/templates/home.html:16
 msgid "Search"
 msgstr "Cerca"
 
-#: fatcat_scholar/templates/base.html:138
+#: fatcat_scholar/templates/base.html:139
 msgid "User Guide"
 msgstr "Guida Utente"
 
-#: fatcat_scholar/templates/base.html:166
+#: fatcat_scholar/templates/base.html:167
 msgid ""
 "We are a US 501(c)(3) non-profit library, building a global archive of "
 "Internet sites and other cultural artifacts in digital form."
@@ -353,7 +353,7 @@ msgstr ""
 "Siamo una biblioteca US 501(c)(3) senza scopo di lucro, che archivia siti "
 "Internet e altri materiali in forma digitale."
 
-#: fatcat_scholar/templates/base.html:168
+#: fatcat_scholar/templates/base.html:169
 #, python-format
 msgid ""
 "Other projects include %(wayback)s, %(archive_org)s, %(openlibrary)s, and "
@@ -362,47 +362,47 @@ msgstr ""
 "Altri progetti includono %(wayback)s, %(archive_org)s, %(openlibrary)s e "
 "%(archive_it)s."
 
-#: fatcat_scholar/templates/base.html:175
+#: fatcat_scholar/templates/base.html:176
 msgid "About Us"
 msgstr "Chi siamo"
 
-#: fatcat_scholar/templates/base.html:176
+#: fatcat_scholar/templates/base.html:177
 msgid "Contact Us"
 msgstr "Contattaci"
 
-#: fatcat_scholar/templates/base.html:177
+#: fatcat_scholar/templates/base.html:178
 msgid "Policies"
 msgstr "Linee di condotta"
 
-#: fatcat_scholar/templates/base.html:178
+#: fatcat_scholar/templates/base.html:179
 msgid "Donate"
 msgstr "Fai una donazione"
 
-#: fatcat_scholar/templates/base.html:184
+#: fatcat_scholar/templates/base.html:185
 msgid "Open Infrastructure"
 msgstr "Infrastruttura aperta"
 
-#: fatcat_scholar/templates/base.html:186
+#: fatcat_scholar/templates/base.html:187
 msgid "Editable Catalog (Fatcat)"
 msgstr "Catalogo modificabile (Fatcat)"
 
-#: fatcat_scholar/templates/base.html:187
+#: fatcat_scholar/templates/base.html:188
 msgid "Contribute"
 msgstr "Contribuisci"
 
-#: fatcat_scholar/templates/base.html:188
+#: fatcat_scholar/templates/base.html:189
 msgid "Search API"
 msgstr "API ricerca"
 
-#: fatcat_scholar/templates/base.html:189
+#: fatcat_scholar/templates/base.html:190
 msgid "Service Status"
 msgstr "Stato del servizio"
 
-#: fatcat_scholar/templates/base.html:190
+#: fatcat_scholar/templates/base.html:191
 msgid "Source Code"
 msgstr "Codice sorgente"
 
-#: fatcat_scholar/templates/base.html:199
+#: fatcat_scholar/templates/base.html:200
 msgid "Help"
 msgstr "Aiuto"
 
@@ -661,6 +661,10 @@ msgstr ""
 "Quando l'opera è archiviata per intero su una piattaforma affidabile e "
 "aperta, forniremo ulteriori link"
 
+#: fatcat_scholar/templates/help.html:148
+msgid "Tags"
+msgstr ""
+
 #: fatcat_scholar/templates/help.html:150
 msgid ""
 "Search results may have tag labels which provide additional context about "
@@ -750,6 +754,10 @@ msgstr ""
 "Conservato e/o ospitato sulla piattaforma di conservazione digitale <a href="
 "\"https://en.wikipedia.org/wiki/JSTOR\">JSTOR</a>"
 
+#: fatcat_scholar/templates/help.html:198
+msgid "Persistent Identifiers"
+msgstr ""
+
 #: fatcat_scholar/templates/help.html:200
 msgid ""
 "Underneath search results, and alternate version listings, are any known "
diff --git a/fatcat_scholar/translations/ko/LC_MESSAGES/messages.po b/fatcat_scholar/translations/ko/LC_MESSAGES/messages.po
index 5303ecb..950f6d6 100644
--- a/fatcat_scholar/translations/ko/LC_MESSAGES/messages.po
+++ b/fatcat_scholar/translations/ko/LC_MESSAGES/messages.po
@@ -8,7 +8,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: PROJECT VERSION\n"
 "Report-Msgid-Bugs-To: EMAIL@ADDRESS\n"
-"POT-Creation-Date: 2021-08-12 16:37-0700\n"
+"POT-Creation-Date: 2021-11-10 16:26-0800\n"
 "PO-Revision-Date: 2021-05-11 06:32+0000\n"
 "Last-Translator: YiReun <zleonoti@gmail.com>\n"
 "Language-Team: Korean <https://hosted.weblate.org/projects/internetarchive/"
@@ -21,83 +21,83 @@ msgstr ""
 "X-Generator: Weblate 4.7-dev\n"
 "Generated-By: Babel 2.6.0\n"
 
-#: fatcat_scholar/search.py:44
+#: fatcat_scholar/search.py:45
 msgid "Release Date"
 msgstr "배포 날짜"
 
-#: fatcat_scholar/search.py:48
+#: fatcat_scholar/search.py:49
 msgid "All Time"
 msgstr "모든 기간"
 
-#: fatcat_scholar/search.py:49
+#: fatcat_scholar/search.py:50
 msgid "Past Week"
 msgstr "지난주"
 
-#: fatcat_scholar/search.py:50
+#: fatcat_scholar/search.py:51
 msgid "Past Year"
 msgstr "작년"
 
-#: fatcat_scholar/search.py:51
+#: fatcat_scholar/search.py:52
 msgid "Since 2000"
 msgstr "2000년부터"
 
-#: fatcat_scholar/search.py:52
+#: fatcat_scholar/search.py:53
 msgid "Before 1925"
 msgstr "1925년 이전"
 
-#: fatcat_scholar/search.py:56
+#: fatcat_scholar/search.py:57
 msgid "Resource Type"
 msgstr "자원 유형"
 
-#: fatcat_scholar/search.py:60
+#: fatcat_scholar/search.py:61
 msgid "Papers"
 msgstr "논문"
 
-#: fatcat_scholar/search.py:61
+#: fatcat_scholar/search.py:62
 msgid "Reports"
 msgstr "보고서"
 
-#: fatcat_scholar/search.py:62
+#: fatcat_scholar/search.py:63
 msgid "Datasets"
 msgstr "데이터 세트"
 
-#: fatcat_scholar/search.py:63
+#: fatcat_scholar/search.py:64
 msgid "Everything"
 msgstr "모두"
 
-#: fatcat_scholar/search.py:67
+#: fatcat_scholar/search.py:68
 msgid "Availability"
 msgstr "사용 가능 형태"
 
-#: fatcat_scholar/search.py:71
+#: fatcat_scholar/search.py:72
 msgid "Fulltext"
 msgstr "전문"
 
-#: fatcat_scholar/search.py:72
+#: fatcat_scholar/search.py:73
 msgid "Microfilm"
 msgstr "마이크로 필름"
 
-#: fatcat_scholar/search.py:73 fatcat_scholar/templates/search_macros.html:4
+#: fatcat_scholar/search.py:74 fatcat_scholar/templates/search_macros.html:4
 msgid "Open Access"
 msgstr "오픈 액세스"
 
-#: fatcat_scholar/search.py:74
+#: fatcat_scholar/search.py:75
 msgid "Metadata"
 msgstr "메타데이터"
 
-#: fatcat_scholar/search.py:78
+#: fatcat_scholar/search.py:79
 msgid "Sort Order"
 msgstr "정렬 순서"
 
-#: fatcat_scholar/search.py:82
+#: fatcat_scholar/search.py:83
 msgid "Relevancy"
 msgstr "관련성"
 
-#: fatcat_scholar/search.py:83
+#: fatcat_scholar/search.py:84
 msgid "Recent First"
 msgstr "최신순"
 
-#: fatcat_scholar/search.py:84
+#: fatcat_scholar/search.py:85
 msgid "Oldest First"
 msgstr "과거순"
 
@@ -120,7 +120,7 @@ msgstr ""
 "진 문제 목록"
 
 #: fatcat_scholar/templates/about.html:14
-#: fatcat_scholar/templates/base.html:196
+#: fatcat_scholar/templates/base.html:197
 msgid "How It Works"
 msgstr "작동 원리"
 
@@ -160,7 +160,7 @@ msgstr ""
 "트의 기술적 인프라와 목표에 대한 개요를 제공합니다."
 
 #: fatcat_scholar/templates/about.html:27
-#: fatcat_scholar/templates/base.html:197
+#: fatcat_scholar/templates/base.html:198
 msgid "Content Sources"
 msgstr "콘텐츠 소스"
 
@@ -179,7 +179,7 @@ msgstr ""
 "질문이 있으면 <a href=\"#contact\"> Google에 문의 </a>하세요."
 
 #: fatcat_scholar/templates/about.html:35
-#: fatcat_scholar/templates/base.html:198
+#: fatcat_scholar/templates/base.html:199
 msgid "Text and Data Mining"
 msgstr "텍스트 및 데이터 마이닝"
 
@@ -308,35 +308,35 @@ msgstr ""
 msgid "Fatcat catalog page"
 msgstr ""
 
-#: fatcat_scholar/templates/base.html:12
+#: fatcat_scholar/templates/base.html:13
 msgid "Internet Archive Scholar"
 msgstr "인터넷 아카이브 학자"
 
-#: fatcat_scholar/templates/base.html:82
+#: fatcat_scholar/templates/base.html:83
 msgid "language selection menu"
 msgstr "언어 선택 메뉴"
 
-#: fatcat_scholar/templates/base.html:104
+#: fatcat_scholar/templates/base.html:105
 msgid "Contribute to translations"
 msgstr "번역에 기여"
 
-#: fatcat_scholar/templates/base.html:127
+#: fatcat_scholar/templates/base.html:128
 msgid "by title, authors, keywords..."
 msgstr "제목, 저자, 키워드 ..."
 
-#: fatcat_scholar/templates/base.html:127
+#: fatcat_scholar/templates/base.html:128
 msgid "search for papers"
 msgstr "논문 검색"
 
-#: fatcat_scholar/templates/base.html:128 fatcat_scholar/templates/home.html:16
+#: fatcat_scholar/templates/base.html:129 fatcat_scholar/templates/home.html:16
 msgid "Search"
 msgstr "검색"
 
-#: fatcat_scholar/templates/base.html:138
+#: fatcat_scholar/templates/base.html:139
 msgid "User Guide"
 msgstr "사용자 가이드"
 
-#: fatcat_scholar/templates/base.html:166
+#: fatcat_scholar/templates/base.html:167
 msgid ""
 "We are a US 501(c)(3) non-profit library, building a global archive of "
 "Internet sites and other cultural artifacts in digital form."
@@ -344,7 +344,7 @@ msgstr ""
 "우리는 미국 501(c)(3) 비영리 도서관으로, 인터넷 사이트 및 기타 문화 유물을 디"
 "지털 형식의 글로벌 아카이브로 구축하고 있습니다."
 
-#: fatcat_scholar/templates/base.html:168
+#: fatcat_scholar/templates/base.html:169
 #, python-format
 msgid ""
 "Other projects include %(wayback)s, %(archive_org)s, %(openlibrary)s, and "
@@ -353,47 +353,47 @@ msgstr ""
 "다른 프로젝트로는 %(wayback)s, %(archive_org)s, %(openlibrary)s, "
 "%(archive_it)s이 있습니다."
 
-#: fatcat_scholar/templates/base.html:175
+#: fatcat_scholar/templates/base.html:176
 msgid "About Us"
 msgstr "소개"
 
-#: fatcat_scholar/templates/base.html:176
+#: fatcat_scholar/templates/base.html:177
 msgid "Contact Us"
 msgstr "연락처"
 
-#: fatcat_scholar/templates/base.html:177
+#: fatcat_scholar/templates/base.html:178
 msgid "Policies"
 msgstr "정책"
 
-#: fatcat_scholar/templates/base.html:178
+#: fatcat_scholar/templates/base.html:179
 msgid "Donate"
 msgstr "기부"
 
-#: fatcat_scholar/templates/base.html:184
+#: fatcat_scholar/templates/base.html:185
 msgid "Open Infrastructure"
 msgstr "개방형 인프라"
 
-#: fatcat_scholar/templates/base.html:186
+#: fatcat_scholar/templates/base.html:187
 msgid "Editable Catalog (Fatcat)"
 msgstr "편집 가능한 카탈로그(Fatcat)"
 
-#: fatcat_scholar/templates/base.html:187
+#: fatcat_scholar/templates/base.html:188
 msgid "Contribute"
 msgstr "기여"
 
-#: fatcat_scholar/templates/base.html:188
+#: fatcat_scholar/templates/base.html:189
 msgid "Search API"
 msgstr "검색 API"
 
-#: fatcat_scholar/templates/base.html:189
+#: fatcat_scholar/templates/base.html:190
 msgid "Service Status"
 msgstr "서비스 상태"
 
-#: fatcat_scholar/templates/base.html:190
+#: fatcat_scholar/templates/base.html:191
 msgid "Source Code"
 msgstr "소스 코드"
 
-#: fatcat_scholar/templates/base.html:199
+#: fatcat_scholar/templates/base.html:200
 msgid "Help"
 msgstr "도움"
 
@@ -637,6 +637,10 @@ msgstr ""
 "작업이 신뢰할 수있는 개방형 플랫폼에 전체적으로 보관되는 경우 때때로 추가 링"
 "크를 제공합니다"
 
+#: fatcat_scholar/templates/help.html:148
+msgid "Tags"
+msgstr ""
+
 #: fatcat_scholar/templates/help.html:150
 msgid ""
 "Search results may have tag labels which provide additional context about "
@@ -724,6 +728,10 @@ msgstr ""
 "<a href=\"https://en.wikipedia.org/wiki/JSTOR\"> JSTOR </a> 디지털 보존 플랫"
 "폼에서 보존 및 / 또는 호스팅"
 
+#: fatcat_scholar/templates/help.html:198
+msgid "Persistent Identifiers"
+msgstr ""
+
 #: fatcat_scholar/templates/help.html:200
 msgid ""
 "Underneath search results, and alternate version listings, are any known "
diff --git a/fatcat_scholar/translations/nb/LC_MESSAGES/messages.po b/fatcat_scholar/translations/nb/LC_MESSAGES/messages.po
index efe173a..1780db8 100644
--- a/fatcat_scholar/translations/nb/LC_MESSAGES/messages.po
+++ b/fatcat_scholar/translations/nb/LC_MESSAGES/messages.po
@@ -8,7 +8,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: PROJECT VERSION\n"
 "Report-Msgid-Bugs-To: EMAIL@ADDRESS\n"
-"POT-Creation-Date: 2021-08-12 16:37-0700\n"
+"POT-Creation-Date: 2021-11-10 16:26-0800\n"
 "PO-Revision-Date: 2021-02-09 03:50+0000\n"
 "Last-Translator: Allan Nordhøy <epost@anotheragency.no>\n"
 "Language-Team: Norwegian Bokmål <https://hosted.weblate.org/projects/"
@@ -21,83 +21,83 @@ msgstr ""
 "X-Generator: Weblate 4.5-dev\n"
 "Generated-By: Babel 2.8.0\n"
 
-#: fatcat_scholar/search.py:44
+#: fatcat_scholar/search.py:45
 msgid "Release Date"
 msgstr "Utgivelsesdato"
 
-#: fatcat_scholar/search.py:48
+#: fatcat_scholar/search.py:49
 msgid "All Time"
 msgstr "Siden begynnelsen"
 
-#: fatcat_scholar/search.py:49
+#: fatcat_scholar/search.py:50
 msgid "Past Week"
 msgstr "Siste uke"
 
-#: fatcat_scholar/search.py:50
+#: fatcat_scholar/search.py:51
 msgid "Past Year"
 msgstr "Siste år"
 
-#: fatcat_scholar/search.py:51
+#: fatcat_scholar/search.py:52
 msgid "Since 2000"
 msgstr "Siden 2000"
 
-#: fatcat_scholar/search.py:52
+#: fatcat_scholar/search.py:53
 msgid "Before 1925"
 msgstr "Før 1925"
 
-#: fatcat_scholar/search.py:56
+#: fatcat_scholar/search.py:57
 msgid "Resource Type"
 msgstr "Ressurstype"
 
-#: fatcat_scholar/search.py:60
+#: fatcat_scholar/search.py:61
 msgid "Papers"
 msgstr "Publiseringer"
 
-#: fatcat_scholar/search.py:61
+#: fatcat_scholar/search.py:62
 msgid "Reports"
 msgstr "Rapporter"
 
-#: fatcat_scholar/search.py:62
+#: fatcat_scholar/search.py:63
 msgid "Datasets"
 msgstr "Datasett"
 
-#: fatcat_scholar/search.py:63
+#: fatcat_scholar/search.py:64
 msgid "Everything"
 msgstr "Alt"
 
-#: fatcat_scholar/search.py:67
+#: fatcat_scholar/search.py:68
 msgid "Availability"
 msgstr "Tilgjengelighet"
 
-#: fatcat_scholar/search.py:71
+#: fatcat_scholar/search.py:72
 msgid "Fulltext"
 msgstr "Fulltekst"
 
-#: fatcat_scholar/search.py:72
+#: fatcat_scholar/search.py:73
 msgid "Microfilm"
 msgstr "Mikrofilm"
 
-#: fatcat_scholar/search.py:73 fatcat_scholar/templates/search_macros.html:4
+#: fatcat_scholar/search.py:74 fatcat_scholar/templates/search_macros.html:4
 msgid "Open Access"
 msgstr "Åpen tilgang"
 
-#: fatcat_scholar/search.py:74
+#: fatcat_scholar/search.py:75
 msgid "Metadata"
 msgstr "Metadata"
 
-#: fatcat_scholar/search.py:78
+#: fatcat_scholar/search.py:79
 msgid "Sort Order"
 msgstr "Sorteringsrekkefølge"
 
-#: fatcat_scholar/search.py:82
+#: fatcat_scholar/search.py:83
 msgid "Relevancy"
 msgstr "Relevans"
 
-#: fatcat_scholar/search.py:83
+#: fatcat_scholar/search.py:84
 msgid "Recent First"
 msgstr "Nyligste først"
 
-#: fatcat_scholar/search.py:84
+#: fatcat_scholar/search.py:85
 msgid "Oldest First"
 msgstr "Eldste først"
 
@@ -120,7 +120,7 @@ msgid ""
 msgstr ""
 
 #: fatcat_scholar/templates/about.html:14
-#: fatcat_scholar/templates/base.html:196
+#: fatcat_scholar/templates/base.html:197
 msgid "How It Works"
 msgstr "Hvordan det fungerer"
 
@@ -153,7 +153,7 @@ msgid ""
 msgstr ""
 
 #: fatcat_scholar/templates/about.html:27
-#: fatcat_scholar/templates/base.html:197
+#: fatcat_scholar/templates/base.html:198
 msgid "Content Sources"
 msgstr "Innholdskilder"
 
@@ -167,7 +167,7 @@ msgid ""
 msgstr ""
 
 #: fatcat_scholar/templates/about.html:35
-#: fatcat_scholar/templates/base.html:198
+#: fatcat_scholar/templates/base.html:199
 msgid "Text and Data Mining"
 msgstr "Tekst og datautvinning"
 
@@ -281,38 +281,38 @@ msgstr ""
 msgid "Fatcat catalog page"
 msgstr ""
 
-#: fatcat_scholar/templates/base.html:12
+#: fatcat_scholar/templates/base.html:13
 #, fuzzy
 #| msgid "Internet Archive Scholar logo (vaporwave)"
 msgid "Internet Archive Scholar"
 msgstr "Internet Archive Scholar-logo (vaporwave)"
 
-#: fatcat_scholar/templates/base.html:82
+#: fatcat_scholar/templates/base.html:83
 msgid "language selection menu"
 msgstr "Språkvalgsmeny"
 
-#: fatcat_scholar/templates/base.html:104
+#: fatcat_scholar/templates/base.html:105
 msgid "Contribute to translations"
 msgstr "Bidra til oversettelsene"
 
-#: fatcat_scholar/templates/base.html:127
+#: fatcat_scholar/templates/base.html:128
 #, fuzzy
 msgid "by title, authors, keywords..."
 msgstr "etter tittel, forfattere, nøkkelord…"
 
-#: fatcat_scholar/templates/base.html:127
+#: fatcat_scholar/templates/base.html:128
 msgid "search for papers"
 msgstr "søk etter publiseringer"
 
-#: fatcat_scholar/templates/base.html:128 fatcat_scholar/templates/home.html:16
+#: fatcat_scholar/templates/base.html:129 fatcat_scholar/templates/home.html:16
 msgid "Search"
 msgstr "Søk"
 
-#: fatcat_scholar/templates/base.html:138
+#: fatcat_scholar/templates/base.html:139
 msgid "User Guide"
 msgstr "Brukerveiledning"
 
-#: fatcat_scholar/templates/base.html:166
+#: fatcat_scholar/templates/base.html:167
 msgid ""
 "We are a US 501(c)(3) non-profit library, building a global archive of "
 "Internet sites and other cultural artifacts in digital form."
@@ -320,7 +320,7 @@ msgstr ""
 "Vi er et veldedig US-501(c)(3)-bibliotek, som bygger et verdensomspennende "
 "arkiv av internettsider og andre kulturelle gjenstander i digital form."
 
-#: fatcat_scholar/templates/base.html:168
+#: fatcat_scholar/templates/base.html:169
 #, python-format
 msgid ""
 "Other projects include %(wayback)s, %(archive_org)s, %(openlibrary)s, and "
@@ -329,47 +329,47 @@ msgstr ""
 "Andre prosjekter inkluderer %(wayback)s, %(archive_org)s, %(openlibrary)s, "
 "og %(archive_it)s."
 
-#: fatcat_scholar/templates/base.html:175
+#: fatcat_scholar/templates/base.html:176
 msgid "About Us"
 msgstr "Om oss"
 
-#: fatcat_scholar/templates/base.html:176
+#: fatcat_scholar/templates/base.html:177
 msgid "Contact Us"
 msgstr "Kontakt oss"
 
-#: fatcat_scholar/templates/base.html:177
+#: fatcat_scholar/templates/base.html:178
 msgid "Policies"
 msgstr "Praksiser"
 
-#: fatcat_scholar/templates/base.html:178
+#: fatcat_scholar/templates/base.html:179
 msgid "Donate"
 msgstr "Doner"
 
-#: fatcat_scholar/templates/base.html:184
+#: fatcat_scholar/templates/base.html:185
 msgid "Open Infrastructure"
 msgstr "Åpen infrastruktur"
 
-#: fatcat_scholar/templates/base.html:186
+#: fatcat_scholar/templates/base.html:187
 msgid "Editable Catalog (Fatcat)"
 msgstr "Redigerbar katalog (Fatcat)"
 
-#: fatcat_scholar/templates/base.html:187
+#: fatcat_scholar/templates/base.html:188
 msgid "Contribute"
 msgstr "Bidra"
 
-#: fatcat_scholar/templates/base.html:188
+#: fatcat_scholar/templates/base.html:189
 msgid "Search API"
 msgstr "Søke-API"
 
-#: fatcat_scholar/templates/base.html:189
+#: fatcat_scholar/templates/base.html:190
 msgid "Service Status"
 msgstr "Tjenestestatus"
 
-#: fatcat_scholar/templates/base.html:190
+#: fatcat_scholar/templates/base.html:191
 msgid "Source Code"
 msgstr "Kildekode"
 
-#: fatcat_scholar/templates/base.html:199
+#: fatcat_scholar/templates/base.html:200
 msgid "Help"
 msgstr "Hjelp"
 
@@ -579,6 +579,10 @@ msgid ""
 "sometimes provide additional links"
 msgstr ""
 
+#: fatcat_scholar/templates/help.html:148
+msgid "Tags"
+msgstr ""
+
 #: fatcat_scholar/templates/help.html:150
 msgid ""
 "Search results may have tag labels which provide additional context about "
@@ -655,6 +659,10 @@ msgid ""
 "\">JSTOR</a> digital preservation platform"
 msgstr ""
 
+#: fatcat_scholar/templates/help.html:198
+msgid "Persistent Identifiers"
+msgstr ""
+
 #: fatcat_scholar/templates/help.html:200
 msgid ""
 "Underneath search results, and alternate version listings, are any known "
diff --git a/fatcat_scholar/translations/nl/LC_MESSAGES/messages.po b/fatcat_scholar/translations/nl/LC_MESSAGES/messages.po
index f332a40..d08ebbf 100644
--- a/fatcat_scholar/translations/nl/LC_MESSAGES/messages.po
+++ b/fatcat_scholar/translations/nl/LC_MESSAGES/messages.po
@@ -8,7 +8,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: PROJECT VERSION\n"
 "Report-Msgid-Bugs-To: EMAIL@ADDRESS\n"
-"POT-Creation-Date: 2021-08-12 16:37-0700\n"
+"POT-Creation-Date: 2021-11-10 16:26-0800\n"
 "PO-Revision-Date: 2021-07-16 17:36+0000\n"
 "Last-Translator: privacysimp <contributions.pqy8k@aleeas.com>\n"
 "Language-Team: Dutch <https://hosted.weblate.org/projects/internetarchive/"
@@ -21,83 +21,83 @@ msgstr ""
 "X-Generator: Weblate 4.7.2-dev\n"
 "Generated-By: Babel 2.6.0\n"
 
-#: fatcat_scholar/search.py:44
+#: fatcat_scholar/search.py:45
 msgid "Release Date"
 msgstr "Datum van Publicatie"
 
-#: fatcat_scholar/search.py:48
+#: fatcat_scholar/search.py:49
 msgid "All Time"
 msgstr "Alle Tijden"
 
-#: fatcat_scholar/search.py:49
+#: fatcat_scholar/search.py:50
 msgid "Past Week"
 msgstr "Afgelopen week"
 
-#: fatcat_scholar/search.py:50
+#: fatcat_scholar/search.py:51
 msgid "Past Year"
 msgstr "Afgelopen Jaar"
 
-#: fatcat_scholar/search.py:51
+#: fatcat_scholar/search.py:52
 msgid "Since 2000"
 msgstr "Sinds 2000"
 
-#: fatcat_scholar/search.py:52
+#: fatcat_scholar/search.py:53
 msgid "Before 1925"
 msgstr "Vóór 1925"
 
-#: fatcat_scholar/search.py:56
+#: fatcat_scholar/search.py:57
 msgid "Resource Type"
 msgstr "Type bron"
 
-#: fatcat_scholar/search.py:60
+#: fatcat_scholar/search.py:61
 msgid "Papers"
 msgstr "Papieren"
 
-#: fatcat_scholar/search.py:61
+#: fatcat_scholar/search.py:62
 msgid "Reports"
 msgstr "Rapporten"
 
-#: fatcat_scholar/search.py:62
+#: fatcat_scholar/search.py:63
 msgid "Datasets"
 msgstr "Datasets"
 
-#: fatcat_scholar/search.py:63
+#: fatcat_scholar/search.py:64
 msgid "Everything"
 msgstr "Alles"
 
-#: fatcat_scholar/search.py:67
+#: fatcat_scholar/search.py:68
 msgid "Availability"
 msgstr "Beschikbaar"
 
-#: fatcat_scholar/search.py:71
+#: fatcat_scholar/search.py:72
 msgid "Fulltext"
 msgstr "Volledige tekst"
 
-#: fatcat_scholar/search.py:72
+#: fatcat_scholar/search.py:73
 msgid "Microfilm"
 msgstr "Microfilm"
 
-#: fatcat_scholar/search.py:73 fatcat_scholar/templates/search_macros.html:4
+#: fatcat_scholar/search.py:74 fatcat_scholar/templates/search_macros.html:4
 msgid "Open Access"
 msgstr "Open toegang"
 
-#: fatcat_scholar/search.py:74
+#: fatcat_scholar/search.py:75
 msgid "Metadata"
 msgstr "Metagegevens"
 
-#: fatcat_scholar/search.py:78
+#: fatcat_scholar/search.py:79
 msgid "Sort Order"
 msgstr "Sorteervolgorde"
 
-#: fatcat_scholar/search.py:82
+#: fatcat_scholar/search.py:83
 msgid "Relevancy"
 msgstr "Relevantie"
 
-#: fatcat_scholar/search.py:83
+#: fatcat_scholar/search.py:84
 msgid "Recent First"
 msgstr "Recente Eerste"
 
-#: fatcat_scholar/search.py:84
+#: fatcat_scholar/search.py:85
 msgid "Oldest First"
 msgstr "Oudste eerst"
 
@@ -120,7 +120,7 @@ msgstr ""
 "enkele bugs en bekende problemen opsomt"
 
 #: fatcat_scholar/templates/about.html:14
-#: fatcat_scholar/templates/base.html:196
+#: fatcat_scholar/templates/base.html:197
 msgid "How It Works"
 msgstr "Hoe het werkt"
 
@@ -161,7 +161,7 @@ msgstr ""
 "het project."
 
 #: fatcat_scholar/templates/about.html:27
-#: fatcat_scholar/templates/base.html:197
+#: fatcat_scholar/templates/base.html:198
 msgid "Content Sources"
 msgstr "Inhoud Bronnen"
 
@@ -182,7 +182,7 @@ msgstr ""
 "<a href=\"#contact\">contact met ons op</a> als u vragen heeft."
 
 #: fatcat_scholar/templates/about.html:35
-#: fatcat_scholar/templates/base.html:198
+#: fatcat_scholar/templates/base.html:199
 msgid "Text and Data Mining"
 msgstr "Tekst- en datamining"
 
@@ -314,35 +314,35 @@ msgstr ""
 msgid "Fatcat catalog page"
 msgstr ""
 
-#: fatcat_scholar/templates/base.html:12
+#: fatcat_scholar/templates/base.html:13
 msgid "Internet Archive Scholar"
 msgstr "Internet Archief Wetenschapper"
 
-#: fatcat_scholar/templates/base.html:82
+#: fatcat_scholar/templates/base.html:83
 msgid "language selection menu"
 msgstr "taalselectiemenu"
 
-#: fatcat_scholar/templates/base.html:104
+#: fatcat_scholar/templates/base.html:105
 msgid "Contribute to translations"
 msgstr "Bijdragen aan vertalingen"
 
-#: fatcat_scholar/templates/base.html:127
+#: fatcat_scholar/templates/base.html:128
 msgid "by title, authors, keywords..."
 msgstr "op titel, auteurs, trefwoorden..."
 
-#: fatcat_scholar/templates/base.html:127
+#: fatcat_scholar/templates/base.html:128
 msgid "search for papers"
 msgstr "naar documenten zoeken"
 
-#: fatcat_scholar/templates/base.html:128 fatcat_scholar/templates/home.html:16
+#: fatcat_scholar/templates/base.html:129 fatcat_scholar/templates/home.html:16
 msgid "Search"
 msgstr "Zoeken"
 
-#: fatcat_scholar/templates/base.html:138
+#: fatcat_scholar/templates/base.html:139
 msgid "User Guide"
 msgstr "Gebruikershandleiding"
 
-#: fatcat_scholar/templates/base.html:166
+#: fatcat_scholar/templates/base.html:167
 msgid ""
 "We are a US 501(c)(3) non-profit library, building a global archive of "
 "Internet sites and other cultural artifacts in digital form."
@@ -351,7 +351,7 @@ msgstr ""
 "wereldwijd archief aanlegt van internetsites en andere culturele artefacten "
 "in digitale vorm."
 
-#: fatcat_scholar/templates/base.html:168
+#: fatcat_scholar/templates/base.html:169
 #, python-format
 msgid ""
 "Other projects include %(wayback)s, %(archive_org)s, %(openlibrary)s, and "
@@ -360,47 +360,47 @@ msgstr ""
 "Andere projecten zijn %(wayback)s, %(archive_org)s, %(openlibrary)s, en "
 "%(archive_it)s."
 
-#: fatcat_scholar/templates/base.html:175
+#: fatcat_scholar/templates/base.html:176
 msgid "About Us"
 msgstr "Over ons"
 
-#: fatcat_scholar/templates/base.html:176
+#: fatcat_scholar/templates/base.html:177
 msgid "Contact Us"
 msgstr "Contact"
 
-#: fatcat_scholar/templates/base.html:177
+#: fatcat_scholar/templates/base.html:178
 msgid "Policies"
 msgstr "Beleidsregels"
 
-#: fatcat_scholar/templates/base.html:178
+#: fatcat_scholar/templates/base.html:179
 msgid "Donate"
 msgstr "Doneer"
 
-#: fatcat_scholar/templates/base.html:184
+#: fatcat_scholar/templates/base.html:185
 msgid "Open Infrastructure"
 msgstr "Open infrastructuur"
 
-#: fatcat_scholar/templates/base.html:186
+#: fatcat_scholar/templates/base.html:187
 msgid "Editable Catalog (Fatcat)"
 msgstr "Bewerkbare catalogus (Fatcat)"
 
-#: fatcat_scholar/templates/base.html:187
+#: fatcat_scholar/templates/base.html:188
 msgid "Contribute"
 msgstr "Draag bij"
 
-#: fatcat_scholar/templates/base.html:188
+#: fatcat_scholar/templates/base.html:189
 msgid "Search API"
 msgstr "Zoek API"
 
-#: fatcat_scholar/templates/base.html:189
+#: fatcat_scholar/templates/base.html:190
 msgid "Service Status"
 msgstr "Dienststatus"
 
-#: fatcat_scholar/templates/base.html:190
+#: fatcat_scholar/templates/base.html:191
 msgid "Source Code"
 msgstr "Broncode"
 
-#: fatcat_scholar/templates/base.html:199
+#: fatcat_scholar/templates/base.html:200
 msgid "Help"
 msgstr "Hulp"
 
@@ -659,6 +659,10 @@ msgstr ""
 "Als het werk volledig gearchiveerd is op een betrouwbaar, open platform, "
 "zullen wij soms extra links geven"
 
+#: fatcat_scholar/templates/help.html:148
+msgid "Tags"
+msgstr ""
+
 #: fatcat_scholar/templates/help.html:150
 msgid ""
 "Search results may have tag labels which provide additional context about "
@@ -747,6 +751,10 @@ msgstr ""
 "Bewaard en/of gehost op het <a href=\"https://en.wikipedia.org/wiki/JSTOR"
 "\">JSTOR</a> platform voor digitale bewaring"
 
+#: fatcat_scholar/templates/help.html:198
+msgid "Persistent Identifiers"
+msgstr ""
+
 #: fatcat_scholar/templates/help.html:200
 msgid ""
 "Underneath search results, and alternate version listings, are any known "
diff --git a/fatcat_scholar/translations/pt/LC_MESSAGES/messages.po b/fatcat_scholar/translations/pt/LC_MESSAGES/messages.po
index a766214..ffd3af8 100644
--- a/fatcat_scholar/translations/pt/LC_MESSAGES/messages.po
+++ b/fatcat_scholar/translations/pt/LC_MESSAGES/messages.po
@@ -8,7 +8,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: PROJECT VERSION\n"
 "Report-Msgid-Bugs-To: EMAIL@ADDRESS\n"
-"POT-Creation-Date: 2021-08-12 16:37-0700\n"
+"POT-Creation-Date: 2021-11-10 16:26-0800\n"
 "PO-Revision-Date: 2021-05-11 06:32+0000\n"
 "Last-Translator: ssantos <ssantos@web.de>\n"
 "Language-Team: Portuguese <https://hosted.weblate.org/projects/"
@@ -21,83 +21,83 @@ msgstr ""
 "X-Generator: Weblate 4.7-dev\n"
 "Generated-By: Babel 2.6.0\n"
 
-#: fatcat_scholar/search.py:44
+#: fatcat_scholar/search.py:45
 msgid "Release Date"
 msgstr "Data de Lançamento"
 
-#: fatcat_scholar/search.py:48
+#: fatcat_scholar/search.py:49
 msgid "All Time"
 msgstr "Todo o Tempo"
 
-#: fatcat_scholar/search.py:49
+#: fatcat_scholar/search.py:50
 msgid "Past Week"
 msgstr "Semana passada"
 
-#: fatcat_scholar/search.py:50
+#: fatcat_scholar/search.py:51
 msgid "Past Year"
 msgstr "Ano passado"
 
-#: fatcat_scholar/search.py:51
+#: fatcat_scholar/search.py:52
 msgid "Since 2000"
 msgstr "Desde 2000"
 
-#: fatcat_scholar/search.py:52
+#: fatcat_scholar/search.py:53
 msgid "Before 1925"
 msgstr "Antes de 1925"
 
-#: fatcat_scholar/search.py:56
+#: fatcat_scholar/search.py:57
 msgid "Resource Type"
 msgstr "Tipo de recurso"
 
-#: fatcat_scholar/search.py:60
+#: fatcat_scholar/search.py:61
 msgid "Papers"
 msgstr "Trabalhos"
 
-#: fatcat_scholar/search.py:61
+#: fatcat_scholar/search.py:62
 msgid "Reports"
 msgstr "Relatórios"
 
-#: fatcat_scholar/search.py:62
+#: fatcat_scholar/search.py:63
 msgid "Datasets"
 msgstr "Datasets"
 
-#: fatcat_scholar/search.py:63
+#: fatcat_scholar/search.py:64
 msgid "Everything"
 msgstr "Tudo"
 
-#: fatcat_scholar/search.py:67
+#: fatcat_scholar/search.py:68
 msgid "Availability"
 msgstr "Disponibilidade"
 
-#: fatcat_scholar/search.py:71
+#: fatcat_scholar/search.py:72
 msgid "Fulltext"
 msgstr "Texto Completo"
 
-#: fatcat_scholar/search.py:72
+#: fatcat_scholar/search.py:73
 msgid "Microfilm"
 msgstr "Microfilme"
 
-#: fatcat_scholar/search.py:73 fatcat_scholar/templates/search_macros.html:4
+#: fatcat_scholar/search.py:74 fatcat_scholar/templates/search_macros.html:4
 msgid "Open Access"
 msgstr "Acesso Aberto"
 
-#: fatcat_scholar/search.py:74
+#: fatcat_scholar/search.py:75
 msgid "Metadata"
 msgstr "Metadata"
 
-#: fatcat_scholar/search.py:78
+#: fatcat_scholar/search.py:79
 msgid "Sort Order"
 msgstr "Ordem de classificação"
 
-#: fatcat_scholar/search.py:82
+#: fatcat_scholar/search.py:83
 msgid "Relevancy"
 msgstr "Relevância"
 
-#: fatcat_scholar/search.py:83
+#: fatcat_scholar/search.py:84
 msgid "Recent First"
 msgstr "Recente Primeiro"
 
-#: fatcat_scholar/search.py:84
+#: fatcat_scholar/search.py:85
 msgid "Oldest First"
 msgstr "Mais antigos primeiro"
 
@@ -120,7 +120,7 @@ msgstr ""
 "alguns bugs e problemas conhecidos"
 
 #: fatcat_scholar/templates/about.html:14
-#: fatcat_scholar/templates/base.html:196
+#: fatcat_scholar/templates/base.html:197
 msgid "How It Works"
 msgstr "Como Funciona"
 
@@ -163,7 +163,7 @@ msgstr ""
 "conjunto."
 
 #: fatcat_scholar/templates/about.html:27
-#: fatcat_scholar/templates/base.html:197
+#: fatcat_scholar/templates/base.html:198
 msgid "Content Sources"
 msgstr "Fontes de conteúdo"
 
@@ -183,7 +183,7 @@ msgstr ""
 "<a href=\"#contact\"> contacte-nos</a> se tiver dúvidas."
 
 #: fatcat_scholar/templates/about.html:35
-#: fatcat_scholar/templates/base.html:198
+#: fatcat_scholar/templates/base.html:199
 msgid "Text and Data Mining"
 msgstr "Mineração de texto e dados"
 
@@ -315,35 +315,35 @@ msgstr ""
 msgid "Fatcat catalog page"
 msgstr ""
 
-#: fatcat_scholar/templates/base.html:12
+#: fatcat_scholar/templates/base.html:13
 msgid "Internet Archive Scholar"
 msgstr "Bolsista do Arquivo da Internet"
 
-#: fatcat_scholar/templates/base.html:82
+#: fatcat_scholar/templates/base.html:83
 msgid "language selection menu"
 msgstr "menu de selecção de idioma"
 
-#: fatcat_scholar/templates/base.html:104
+#: fatcat_scholar/templates/base.html:105
 msgid "Contribute to translations"
 msgstr "Contribuir para as traduções"
 
-#: fatcat_scholar/templates/base.html:127
+#: fatcat_scholar/templates/base.html:128
 msgid "by title, authors, keywords..."
 msgstr "por título, autores, palavras-chave..."
 
-#: fatcat_scholar/templates/base.html:127
+#: fatcat_scholar/templates/base.html:128
 msgid "search for papers"
 msgstr "busca de documentos"
 
-#: fatcat_scholar/templates/base.html:128 fatcat_scholar/templates/home.html:16
+#: fatcat_scholar/templates/base.html:129 fatcat_scholar/templates/home.html:16
 msgid "Search"
 msgstr "Procurar"
 
-#: fatcat_scholar/templates/base.html:138
+#: fatcat_scholar/templates/base.html:139
 msgid "User Guide"
 msgstr "Guia do utilizador"
 
-#: fatcat_scholar/templates/base.html:166
+#: fatcat_scholar/templates/base.html:167
 msgid ""
 "We are a US 501(c)(3) non-profit library, building a global archive of "
 "Internet sites and other cultural artifacts in digital form."
@@ -352,7 +352,7 @@ msgstr ""
 "arquivo global de sites da Internet e outros artefatos culturais em formato "
 "digital."
 
-#: fatcat_scholar/templates/base.html:168
+#: fatcat_scholar/templates/base.html:169
 #, python-format
 msgid ""
 "Other projects include %(wayback)s, %(archive_org)s, %(openlibrary)s, and "
@@ -361,47 +361,47 @@ msgstr ""
 "Outros projetos incluem %(wayback)s, %(archive_org)s, %(openlibrary)s, e "
 "%(archive_it)s."
 
-#: fatcat_scholar/templates/base.html:175
+#: fatcat_scholar/templates/base.html:176
 msgid "About Us"
 msgstr "Sobre nós"
 
-#: fatcat_scholar/templates/base.html:176
+#: fatcat_scholar/templates/base.html:177
 msgid "Contact Us"
 msgstr "Entre em contato"
 
-#: fatcat_scholar/templates/base.html:177
+#: fatcat_scholar/templates/base.html:178
 msgid "Policies"
 msgstr "Políticas"
 
-#: fatcat_scholar/templates/base.html:178
+#: fatcat_scholar/templates/base.html:179
 msgid "Donate"
 msgstr "Doar"
 
-#: fatcat_scholar/templates/base.html:184
+#: fatcat_scholar/templates/base.html:185
 msgid "Open Infrastructure"
 msgstr "Infra-estrutura aberta"
 
-#: fatcat_scholar/templates/base.html:186
+#: fatcat_scholar/templates/base.html:187
 msgid "Editable Catalog (Fatcat)"
 msgstr "Catálogo editável (Fatcat)"
 
-#: fatcat_scholar/templates/base.html:187
+#: fatcat_scholar/templates/base.html:188
 msgid "Contribute"
 msgstr "Contribuir"
 
-#: fatcat_scholar/templates/base.html:188
+#: fatcat_scholar/templates/base.html:189
 msgid "Search API"
 msgstr "Pesquisar API"
 
-#: fatcat_scholar/templates/base.html:189
+#: fatcat_scholar/templates/base.html:190
 msgid "Service Status"
 msgstr "Estado do serviço"
 
-#: fatcat_scholar/templates/base.html:190
+#: fatcat_scholar/templates/base.html:191
 msgid "Source Code"
 msgstr "Código fonte"
 
-#: fatcat_scholar/templates/base.html:199
+#: fatcat_scholar/templates/base.html:200
 msgid "Help"
 msgstr "Ajuda"
 
@@ -657,6 +657,10 @@ msgstr ""
 "Se o trabalho for arquivado na íntegra em uma plataforma confiável e aberta, "
 "algumas vezes forneceremos links adicionais"
 
+#: fatcat_scholar/templates/help.html:148
+msgid "Tags"
+msgstr ""
+
 #: fatcat_scholar/templates/help.html:150
 msgid ""
 "Search results may have tag labels which provide additional context about "
@@ -745,6 +749,10 @@ msgstr ""
 "Preservado e/ou hospedado na plataforma de preservação digital <a href="
 "\"https://en.wikipedia.org/wiki/JSTOR\">JSTOR</a>"
 
+#: fatcat_scholar/templates/help.html:198
+msgid "Persistent Identifiers"
+msgstr ""
+
 #: fatcat_scholar/templates/help.html:200
 msgid ""
 "Underneath search results, and alternate version listings, are any known "
diff --git a/fatcat_scholar/translations/ru/LC_MESSAGES/messages.po b/fatcat_scholar/translations/ru/LC_MESSAGES/messages.po
index cfc7bba..3c76b35 100644
--- a/fatcat_scholar/translations/ru/LC_MESSAGES/messages.po
+++ b/fatcat_scholar/translations/ru/LC_MESSAGES/messages.po
@@ -9,8 +9,8 @@
 msgid ""
 msgstr ""
 "Project-Id-Version: PROJECT VERSION\n"
-"Report-Msgid-Bugs-To: bnewbold@archive.org\n"
-"POT-Creation-Date: 2021-08-12 16:37-0700\n"
+"Report-Msgid-Bugs-To: EMAIL@ADDRESS\n"
+"POT-Creation-Date: 2021-11-10 16:26-0800\n"
 "PO-Revision-Date: 2021-10-22 20:42+0000\n"
 "Last-Translator: Artem <Localizer_in_Russian@protonmail.com>\n"
 "Language-Team: Russian <https://hosted.weblate.org/projects/internetarchive/"
@@ -24,83 +24,83 @@ msgstr ""
 "X-Generator: Weblate 4.9-dev\n"
 "Generated-By: Babel 2.8.0\n"
 
-#: fatcat_scholar/search.py:44
+#: fatcat_scholar/search.py:45
 msgid "Release Date"
 msgstr "Дата выпуска"
 
-#: fatcat_scholar/search.py:48
+#: fatcat_scholar/search.py:49
 msgid "All Time"
 msgstr "Всё время"
 
-#: fatcat_scholar/search.py:49
+#: fatcat_scholar/search.py:50
 msgid "Past Week"
 msgstr "На прошлой неделе"
 
-#: fatcat_scholar/search.py:50
+#: fatcat_scholar/search.py:51
 msgid "Past Year"
 msgstr "В прошлом году"
 
-#: fatcat_scholar/search.py:51
+#: fatcat_scholar/search.py:52
 msgid "Since 2000"
 msgstr "С 2000 года"
 
-#: fatcat_scholar/search.py:52
+#: fatcat_scholar/search.py:53
 msgid "Before 1925"
 msgstr "До 1925 года"
 
-#: fatcat_scholar/search.py:56
+#: fatcat_scholar/search.py:57
 msgid "Resource Type"
 msgstr "Тип ресурса"
 
-#: fatcat_scholar/search.py:60
+#: fatcat_scholar/search.py:61
 msgid "Papers"
 msgstr "Научные статьи"
 
-#: fatcat_scholar/search.py:61
+#: fatcat_scholar/search.py:62
 msgid "Reports"
 msgstr "Отчеты"
 
-#: fatcat_scholar/search.py:62
+#: fatcat_scholar/search.py:63
 msgid "Datasets"
 msgstr "Наборы данных"
 
-#: fatcat_scholar/search.py:63
+#: fatcat_scholar/search.py:64
 msgid "Everything"
 msgstr "Всё"
 
-#: fatcat_scholar/search.py:67
+#: fatcat_scholar/search.py:68
 msgid "Availability"
 msgstr "Доступность"
 
-#: fatcat_scholar/search.py:71
+#: fatcat_scholar/search.py:72
 msgid "Fulltext"
 msgstr "Полнотекстовый"
 
-#: fatcat_scholar/search.py:72
+#: fatcat_scholar/search.py:73
 msgid "Microfilm"
 msgstr "Микрофильм"
 
-#: fatcat_scholar/search.py:73 fatcat_scholar/templates/search_macros.html:4
+#: fatcat_scholar/search.py:74 fatcat_scholar/templates/search_macros.html:4
 msgid "Open Access"
 msgstr "Открытый доступ"
 
-#: fatcat_scholar/search.py:74
+#: fatcat_scholar/search.py:75
 msgid "Metadata"
 msgstr "Метаданные"
 
-#: fatcat_scholar/search.py:78
+#: fatcat_scholar/search.py:79
 msgid "Sort Order"
 msgstr "Порядок сортировки"
 
-#: fatcat_scholar/search.py:82
+#: fatcat_scholar/search.py:83
 msgid "Relevancy"
 msgstr "Актуальность"
 
-#: fatcat_scholar/search.py:83
+#: fatcat_scholar/search.py:84
 msgid "Recent First"
 msgstr "Недавние сначала"
 
-#: fatcat_scholar/search.py:84
+#: fatcat_scholar/search.py:85
 msgid "Oldest First"
 msgstr "Сначала старые"
 
@@ -123,7 +123,7 @@ msgstr ""
 "котором перечислены некоторые ошибки и известные проблемы"
 
 #: fatcat_scholar/templates/about.html:14
-#: fatcat_scholar/templates/base.html:196
+#: fatcat_scholar/templates/base.html:197
 msgid "How It Works"
 msgstr "Как это работает"
 
@@ -164,7 +164,7 @@ msgstr ""
 "обзор технической инфраструктуры и целей проекта в целом."
 
 #: fatcat_scholar/templates/about.html:27
-#: fatcat_scholar/templates/base.html:197
+#: fatcat_scholar/templates/base.html:198
 msgid "Content Sources"
 msgstr "Источники контента"
 
@@ -185,7 +185,7 @@ msgstr ""
 "<a href=\"#contact\"> свяжитесь с нами </a>, если у вас есть вопросы."
 
 #: fatcat_scholar/templates/about.html:35
-#: fatcat_scholar/templates/base.html:198
+#: fatcat_scholar/templates/base.html:199
 msgid "Text and Data Mining"
 msgstr "Интеллектуальный анализ текста и данных"
 
@@ -319,35 +319,35 @@ msgstr "доступ к целевой странице fatcat"
 msgid "Fatcat catalog page"
 msgstr "доступ к целевой странице fatcat"
 
-#: fatcat_scholar/templates/base.html:12
+#: fatcat_scholar/templates/base.html:13
 msgid "Internet Archive Scholar"
 msgstr "Академия архива Интернета"
 
-#: fatcat_scholar/templates/base.html:82
+#: fatcat_scholar/templates/base.html:83
 msgid "language selection menu"
 msgstr "меню выбора языка"
 
-#: fatcat_scholar/templates/base.html:104
+#: fatcat_scholar/templates/base.html:105
 msgid "Contribute to translations"
 msgstr "Внести свой вклад в переводы"
 
-#: fatcat_scholar/templates/base.html:127
+#: fatcat_scholar/templates/base.html:128
 msgid "by title, authors, keywords..."
 msgstr "по названию, авторам, ключевым словам..."
 
-#: fatcat_scholar/templates/base.html:127
+#: fatcat_scholar/templates/base.html:128
 msgid "search for papers"
 msgstr "поиск документов"
 
-#: fatcat_scholar/templates/base.html:128 fatcat_scholar/templates/home.html:16
+#: fatcat_scholar/templates/base.html:129 fatcat_scholar/templates/home.html:16
 msgid "Search"
 msgstr "Поиск"
 
-#: fatcat_scholar/templates/base.html:138
+#: fatcat_scholar/templates/base.html:139
 msgid "User Guide"
 msgstr "Руководство пользователя"
 
-#: fatcat_scholar/templates/base.html:166
+#: fatcat_scholar/templates/base.html:167
 msgid ""
 "We are a US 501(c)(3) non-profit library, building a global archive of "
 "Internet sites and other cultural artifacts in digital form."
@@ -355,7 +355,7 @@ msgstr ""
 "Мы - некоммерческая библиотека US 501(c)(3), создающая глобальный архив "
 "Интернет-сайтов и других культурных артефактов в цифровой форме."
 
-#: fatcat_scholar/templates/base.html:168
+#: fatcat_scholar/templates/base.html:169
 #, python-format
 msgid ""
 "Other projects include %(wayback)s, %(archive_org)s, %(openlibrary)s, and "
@@ -364,47 +364,47 @@ msgstr ""
 "Другие проекты включают в себя %(wayback)s, %(archive_org)s, "
 "%(openlibrary)s, и %(archive_it)s."
 
-#: fatcat_scholar/templates/base.html:175
+#: fatcat_scholar/templates/base.html:176
 msgid "About Us"
 msgstr "О нас"
 
-#: fatcat_scholar/templates/base.html:176
+#: fatcat_scholar/templates/base.html:177
 msgid "Contact Us"
 msgstr "Связаться с нами"
 
-#: fatcat_scholar/templates/base.html:177
+#: fatcat_scholar/templates/base.html:178
 msgid "Policies"
 msgstr "Политика"
 
-#: fatcat_scholar/templates/base.html:178
+#: fatcat_scholar/templates/base.html:179
 msgid "Donate"
 msgstr "Пожертвовать"
 
-#: fatcat_scholar/templates/base.html:184
+#: fatcat_scholar/templates/base.html:185
 msgid "Open Infrastructure"
 msgstr "Открытая инфраструктура"
 
-#: fatcat_scholar/templates/base.html:186
+#: fatcat_scholar/templates/base.html:187
 msgid "Editable Catalog (Fatcat)"
 msgstr "Редактируемый каталог (Fatcat)"
 
-#: fatcat_scholar/templates/base.html:187
+#: fatcat_scholar/templates/base.html:188
 msgid "Contribute"
 msgstr "Стать участником"
 
-#: fatcat_scholar/templates/base.html:188
+#: fatcat_scholar/templates/base.html:189
 msgid "Search API"
 msgstr "Поисковый API"
 
-#: fatcat_scholar/templates/base.html:189
+#: fatcat_scholar/templates/base.html:190
 msgid "Service Status"
 msgstr "Статус сервиса"
 
-#: fatcat_scholar/templates/base.html:190
+#: fatcat_scholar/templates/base.html:191
 msgid "Source Code"
 msgstr "Исходный код"
 
-#: fatcat_scholar/templates/base.html:199
+#: fatcat_scholar/templates/base.html:200
 msgid "Help"
 msgstr "Справка"
 
@@ -658,6 +658,10 @@ msgstr ""
 "Если работа полностью заархивирована на надежной, открытой платформе, то "
 "иногда мы предоставляем дополнительные ссылки"
 
+#: fatcat_scholar/templates/help.html:148
+msgid "Tags"
+msgstr ""
+
 #: fatcat_scholar/templates/help.html:150
 msgid ""
 "Search results may have tag labels which provide additional context about "
@@ -746,6 +750,10 @@ msgstr ""
 "Сохранение и/или размещение на платформе <a href=\"https://en.wikipedia.org/"
 "wiki/JSTOR\"> JSTOR</a> для сохранения цифровой информации"
 
+#: fatcat_scholar/templates/help.html:198
+msgid "Persistent Identifiers"
+msgstr ""
+
 #: fatcat_scholar/templates/help.html:200
 msgid ""
 "Underneath search results, and alternate version listings, are any known "
diff --git a/fatcat_scholar/translations/zh/LC_MESSAGES/messages.po b/fatcat_scholar/translations/zh/LC_MESSAGES/messages.po
index 8c14ebe..a9e5459 100644
--- a/fatcat_scholar/translations/zh/LC_MESSAGES/messages.po
+++ b/fatcat_scholar/translations/zh/LC_MESSAGES/messages.po
@@ -8,8 +8,8 @@
 msgid ""
 msgstr ""
 "Project-Id-Version: PROJECT VERSION\n"
-"Report-Msgid-Bugs-To: bnewbold@archive.org\n"
-"POT-Creation-Date: 2021-08-12 16:37-0700\n"
+"Report-Msgid-Bugs-To: EMAIL@ADDRESS\n"
+"POT-Creation-Date: 2021-11-10 16:26-0800\n"
 "PO-Revision-Date: 2021-09-28 15:36+0000\n"
 "Last-Translator: Eric <spice2wolf@gmail.com>\n"
 "Language-Team: Chinese (Simplified) <https://hosted.weblate.org/projects/"
@@ -22,83 +22,83 @@ msgstr ""
 "X-Generator: Weblate 4.9-dev\n"
 "Generated-By: Babel 2.8.0\n"
 
-#: fatcat_scholar/search.py:44
+#: fatcat_scholar/search.py:45
 msgid "Release Date"
 msgstr "发布日期"
 
-#: fatcat_scholar/search.py:48
+#: fatcat_scholar/search.py:49
 msgid "All Time"
 msgstr "整天"
 
-#: fatcat_scholar/search.py:49
+#: fatcat_scholar/search.py:50
 msgid "Past Week"
 msgstr "上周"
 
-#: fatcat_scholar/search.py:50
+#: fatcat_scholar/search.py:51
 msgid "Past Year"
 msgstr "过去一年"
 
-#: fatcat_scholar/search.py:51
+#: fatcat_scholar/search.py:52
 msgid "Since 2000"
 msgstr "自2000年以来"
 
-#: fatcat_scholar/search.py:52
+#: fatcat_scholar/search.py:53
 msgid "Before 1925"
 msgstr "1925年之前"
 
-#: fatcat_scholar/search.py:56
+#: fatcat_scholar/search.py:57
 msgid "Resource Type"
 msgstr "资源类型"
 
-#: fatcat_scholar/search.py:60
+#: fatcat_scholar/search.py:61
 msgid "Papers"
 msgstr "文件"
 
-#: fatcat_scholar/search.py:61
+#: fatcat_scholar/search.py:62
 msgid "Reports"
 msgstr "报告书"
 
-#: fatcat_scholar/search.py:62
+#: fatcat_scholar/search.py:63
 msgid "Datasets"
 msgstr "数据集"
 
-#: fatcat_scholar/search.py:63
+#: fatcat_scholar/search.py:64
 msgid "Everything"
 msgstr "一切"
 
-#: fatcat_scholar/search.py:67
+#: fatcat_scholar/search.py:68
 msgid "Availability"
 msgstr "可用性"
 
-#: fatcat_scholar/search.py:71
+#: fatcat_scholar/search.py:72
 msgid "Fulltext"
 msgstr "全文"
 
-#: fatcat_scholar/search.py:72
+#: fatcat_scholar/search.py:73
 msgid "Microfilm"
 msgstr "缩微胶卷"
 
-#: fatcat_scholar/search.py:73 fatcat_scholar/templates/search_macros.html:4
+#: fatcat_scholar/search.py:74 fatcat_scholar/templates/search_macros.html:4
 msgid "Open Access"
 msgstr "开放存取"
 
-#: fatcat_scholar/search.py:74
+#: fatcat_scholar/search.py:75
 msgid "Metadata"
 msgstr "元数据"
 
-#: fatcat_scholar/search.py:78
+#: fatcat_scholar/search.py:79
 msgid "Sort Order"
 msgstr "排序"
 
-#: fatcat_scholar/search.py:82
+#: fatcat_scholar/search.py:83
 msgid "Relevancy"
 msgstr "关联"
 
-#: fatcat_scholar/search.py:83
+#: fatcat_scholar/search.py:84
 msgid "Recent First"
 msgstr "最近第一"
 
-#: fatcat_scholar/search.py:84
+#: fatcat_scholar/search.py:85
 msgid "Oldest First"
 msgstr "最早的优先"
 
@@ -121,7 +121,7 @@ msgstr ""
 "题"
 
 #: fatcat_scholar/templates/about.html:14
-#: fatcat_scholar/templates/base.html:196
+#: fatcat_scholar/templates/base.html:197
 msgid "How It Works"
 msgstr "怎么运行的"
 
@@ -160,7 +160,7 @@ msgstr ""
 "和目标。"
 
 #: fatcat_scholar/templates/about.html:27
-#: fatcat_scholar/templates/base.html:197
+#: fatcat_scholar/templates/base.html:198
 msgid "Content Sources"
 msgstr "内容来源"
 
@@ -178,7 +178,7 @@ msgstr ""
 "<a href=\"#contact\">如有疑问请联系我们</a>。"
 
 #: fatcat_scholar/templates/about.html:35
-#: fatcat_scholar/templates/base.html:198
+#: fatcat_scholar/templates/base.html:199
 msgid "Text and Data Mining"
 msgstr "文本和数据挖掘"
 
@@ -254,8 +254,9 @@ msgid ""
 "project (see <a href=\"%(blog_url)s\">original announcement</a>).\n"
 msgstr ""
 "\n"
-"安德鲁W·梅隆基金会通过 <a href=\"%(grant_url)s\">“确保开放获取期刊文献的持续获取“</a> 项目的多个阶段支持了 "
-"Internet Archive 学术的工作 (见 <a href=\"%(blog_url)s\">原始声明</a>)。\n"
+"安德鲁W·梅隆基金会通过 <a href=\"%(grant_url)s\">“确保开放获取期刊文献的持续"
+"获取“</a> 项目的多个阶段支持了 Internet Archive 学术的工作 (见 <a href="
+"\"%(blog_url)s\">原始声明</a>)。\n"
 
 #: fatcat_scholar/templates/about.html:64
 #, python-format
@@ -280,7 +281,8 @@ msgstr "我们找不到您尝试的 URL 的有效重定向。我们对此很抱�
 msgid ""
 "There may be a typo, truncation, or encoding error. Or, the resource may "
 "have been removed from our catalog."
-msgstr "可能存在拼写错误、截断或编码错误。 或者，该资源可能已从我们的目录中删除。"
+msgstr ""
+"可能存在拼写错误、截断或编码错误。 或者，该资源可能已从我们的目录中删除。"
 
 #: fatcat_scholar/templates/access_404.html:13
 msgid ""
@@ -308,35 +310,35 @@ msgstr "学术登录页面"
 msgid "Fatcat catalog page"
 msgstr "Fatcat 目录页"
 
-#: fatcat_scholar/templates/base.html:12
+#: fatcat_scholar/templates/base.html:13
 msgid "Internet Archive Scholar"
 msgstr "互联网档案学术"
 
-#: fatcat_scholar/templates/base.html:82
+#: fatcat_scholar/templates/base.html:83
 msgid "language selection menu"
 msgstr "语言选择菜单"
 
-#: fatcat_scholar/templates/base.html:104
+#: fatcat_scholar/templates/base.html:105
 msgid "Contribute to translations"
 msgstr "贡献翻译"
 
-#: fatcat_scholar/templates/base.html:127
+#: fatcat_scholar/templates/base.html:128
 msgid "by title, authors, keywords..."
 msgstr "按标题、作者、关键词... ..."
 
-#: fatcat_scholar/templates/base.html:127
+#: fatcat_scholar/templates/base.html:128
 msgid "search for papers"
 msgstr "搜索论文"
 
-#: fatcat_scholar/templates/base.html:128 fatcat_scholar/templates/home.html:16
+#: fatcat_scholar/templates/base.html:129 fatcat_scholar/templates/home.html:16
 msgid "Search"
 msgstr "搜索"
 
-#: fatcat_scholar/templates/base.html:138
+#: fatcat_scholar/templates/base.html:139
 msgid "User Guide"
 msgstr "用户指南"
 
-#: fatcat_scholar/templates/base.html:166
+#: fatcat_scholar/templates/base.html:167
 msgid ""
 "We are a US 501(c)(3) non-profit library, building a global archive of "
 "Internet sites and other cultural artifacts in digital form."
@@ -344,7 +346,7 @@ msgstr ""
 "我们是一家美国的501(c)(3)非营利图书馆，旨在以数字形式建立一个互联网站点和其他"
 "文化文物的全球档案馆。"
 
-#: fatcat_scholar/templates/base.html:168
+#: fatcat_scholar/templates/base.html:169
 #, python-format
 msgid ""
 "Other projects include %(wayback)s, %(archive_org)s, %(openlibrary)s, and "
@@ -352,47 +354,47 @@ msgid ""
 msgstr ""
 "其他项目包括%(wayback)s、%(archive_org)s、%(openlibrary)s和%(archive_it)s。"
 
-#: fatcat_scholar/templates/base.html:175
+#: fatcat_scholar/templates/base.html:176
 msgid "About Us"
 msgstr "关于我们"
 
-#: fatcat_scholar/templates/base.html:176
+#: fatcat_scholar/templates/base.html:177
 msgid "Contact Us"
 msgstr "联系我们"
 
-#: fatcat_scholar/templates/base.html:177
+#: fatcat_scholar/templates/base.html:178
 msgid "Policies"
 msgstr "策略"
 
-#: fatcat_scholar/templates/base.html:178
+#: fatcat_scholar/templates/base.html:179
 msgid "Donate"
 msgstr "捐赠"
 
-#: fatcat_scholar/templates/base.html:184
+#: fatcat_scholar/templates/base.html:185
 msgid "Open Infrastructure"
 msgstr "开放基础架构"
 
-#: fatcat_scholar/templates/base.html:186
+#: fatcat_scholar/templates/base.html:187
 msgid "Editable Catalog (Fatcat)"
 msgstr "可编辑目录 (Fatcat)"
 
-#: fatcat_scholar/templates/base.html:187
+#: fatcat_scholar/templates/base.html:188
 msgid "Contribute"
 msgstr "贡献"
 
-#: fatcat_scholar/templates/base.html:188
+#: fatcat_scholar/templates/base.html:189
 msgid "Search API"
 msgstr "搜索 API"
 
-#: fatcat_scholar/templates/base.html:189
+#: fatcat_scholar/templates/base.html:190
 msgid "Service Status"
 msgstr "服务状态"
 
-#: fatcat_scholar/templates/base.html:190
+#: fatcat_scholar/templates/base.html:191
 msgid "Source Code"
 msgstr "源代码"
 
-#: fatcat_scholar/templates/base.html:199
+#: fatcat_scholar/templates/base.html:200
 msgid "Help"
 msgstr "说明"
 
@@ -626,6 +628,10 @@ msgid ""
 "sometimes provide additional links"
 msgstr "如果作品是在可靠的开放平台上完整归档的，则有时我们会提供其他链接"
 
+#: fatcat_scholar/templates/help.html:148
+msgid "Tags"
+msgstr ""
+
 #: fatcat_scholar/templates/help.html:150
 msgid ""
 "Search results may have tag labels which provide additional context about "
@@ -709,6 +715,10 @@ msgstr ""
 "在<a href=\"https://en.wikipedia.org/wiki/JSTOR\"> JSTOR </a>数字保存平台上保"
 "存和/或托管"
 
+#: fatcat_scholar/templates/help.html:198
+msgid "Persistent Identifiers"
+msgstr ""
+
 #: fatcat_scholar/templates/help.html:200
 msgid ""
 "Underneath search results, and alternate version listings, are any known "