web: fix lang detection (include 'en')

If a user had any non-english language preference, was defaulting to
that, even if 'en' had higher preference.

2 files changed, 11 insertions, 1 deletions

diff --git a/fatcat_scholar/hacks.py b/fatcat_scholar/hacks.py
index fc16564..96226ff 100644
--- a/fatcat_scholar/hacks.py
+++ b/fatcat_scholar/hacks.py
@@ -77,3 +77,13 @@ def test_parse_accept_lang() -> None:
         parse_accept_lang("en-ca,en;q=0.8,en-us;q=0.6,de-de;q=0.4,de;q=0.2", ["de"])
         == "de"
     )
+    assert (
+        parse_accept_lang(
+            "en-ca,en;q=0.8,en-us;q=0.6,de-de;q=0.4,de;q=0.2", ["en", "de"]
+        )
+        == "en"
+    )
+    assert (
+        parse_accept_lang("en-US,en;q=0.9,zh-CN;q=0.8,zh;q=0.7", ["zh", "en", "de"])
+        == "en"
+    )
diff --git a/fatcat_scholar/web.py b/fatcat_scholar/web.py
index 79b4f30..2e7359b 100644
--- a/fatcat_scholar/web.py
+++ b/fatcat_scholar/web.py
@@ -43,7 +43,7 @@ class LangPrefix:
         # first try to parse a language code from header
         try:
             accept_code = parse_accept_lang(
-                request.headers.get("accept-language", ""), I18N_LANG_TRANSLATIONS,
+                request.headers.get("accept-language", ""), I18N_LANG_OPTIONS,
             )
             if accept_code:
                 self.code = accept_code