Hi GeoLemmi Could you please report the bug by creating a new issue ticket on Github. https://github.com/thunderbird/thunderbird-android/issues Have you tried removing and adding the account in Thunderbird Android after your language preferences were changed on the server. Could you try this? I was able to replicate the behavior you observe with my hotmail account. I'm theorising that the special folder names are pulled from the server when you first add the account in TB and not refreshed again following a change of language on the server. Your assistance to assist confirm / disprove the theory would be helpful. I can see the german translation of the special folders are 100% complete on weblate and the code's string file below. https://github.com/thunderbird/thunderbird-android/blob/main/legacy/ui/folder/src/main/res/values-de/strings.xml#L1