Ahh, now it works. If I set the language manually in acsetup it works with the Linux port. The whole thing was just a mistake of the language not being set correctly. I set the language by Building the exe and then running winsetup through the editor. So the selected language was not written in the acsetup.cfg that the Linux (and probably Android) port use. And I guess ScummVM is using it's own set configs. So, for the foreseeable future I will use a method like Khris suggested, as that should work everywhere.
So that should be an easy fix.
What I still not get is why the actual translated text is still loaded without the language being set correctly in acsetup and how heltenjon got the error under Windows.
In any case, thank you so much for your help!
QuoteIf i set it as "English" with capital E, then the title also switches to "Berthold's Return".Yeah, I was still using case-sensitive check in the dummy game.

What I still not get is why the actual translated text is still loaded without the language being set correctly in acsetup and how heltenjon got the error under Windows.

In any case, thank you so much for your help!