I've played with it a bit more. It works OK as long as the offending language isn't listed in the "Alternatives". So removing Spanish from the alternatives brings the English folder names back. So I guess there's a bug in the Mozilla platform which we won't get fixed for TB 68.
-- You received this bug notification because you are a member of Desktop Packages, which is subscribed to thunderbird in Ubuntu. https://bugs.launchpad.net/bugs/1847772 Title: E-mail folder names are not localized in thunderbird 68 Status in Mozilla Thunderbird: Fix Released Status in thunderbird package in Ubuntu: Confirmed Bug description: After updating to Thunderbird 68.1.1 from the Ubuntu archive, folder names Inbox, Drafts, Sent, Archives, Spam, Trash all appear in English in the French UI. The rest of the UI is in French. This issue is still present in Thunderbird 1:68.1.2+build1-0ubuntu1. This problem doesn’t exist in Thunderbird 68.1.1 nor in 68.1.2 downloaded directly from Mozilla. To manage notifications about this bug go to: https://bugs.launchpad.net/thunderbird/+bug/1847772/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp