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This is an attempt to fix a bug with random HTML template escapes in
production. I believe these are being caused by cross-request
contamination of template state due to using globals to hold on to
per-language jinja2 templates.
I originally thought this might be a bug in the jinja2 i18n extension
itself, and there may still be concurrency concerns there, but it seems
like the proximal cause is the use of globals.
This change probably has a negative performance impact, because the
jinja2 environment is re-created on every request (though babel files
are not reloaded on every request).
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