I noticed two translation problems with the Email templates in the Administration -> Customize -> Email templates section.
1. Titles of email templates are not translated:
Clarification: The title of an email template is not its subject.
This is because the
AdminEmailTemplateSerializer only “titleizes” the keys of the email templates (e.g.
system_messages.bulk_invite_failed becomes Bulk Invite Failed) here:
2. Four email templates are missing in I18n:
Update: Looks like artifacts, as not referenced anywhere (added links to GitHub search).