[Bug 1847772]

[De-berberich]

I confirm the issue you describe in comment #101. 
I installed TB 68.2.1 (en-US) from the above link, created a new profile and in Preferences (Options) > Advanced > General > Languages > Set Alternatives added French and German as alternatives, thus installing the French and the German language packs in Add-ons > Languages.

Switching from English to French or to German and then switching between German and French works flawlessly and the folder names or correctly localized.
But switching back to English from German or from French doesn't localize the folder names  back in English, they would stay respectively in German or in French.

Removing French and/or German via "Set Alternatives" doesn't work for me. After restarting TB the French and/or German languages are still displayed in the "Thunderbird Language Settings" window and the folder names are still localized in French or German instead of English.
You'll have to remove or at least disable both language packs in Add-ons > Languages to force TB to localize the folder names back to English.

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https://bugs.launchpad.net/bugs/1847772

Title:
  E-mail folder names are not localized in thunderbird 68

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