Ok, then all is correct and all works fine. The translation files is not 100% translated, the Deutsch is incomplete. You can use PoEdit and complete it.

Here are the Doc:

https://wpforo.com/docs/root/translation/translate-using-pot-file/

Ah ok...now I got it! Thanks a lot...

I attach the updated MO/PO file for your releases. Only 3 entries are missing, although in POedit only one is shown...?

Kind regards,
M