Update: This morning my car had to go to the garage for service.
Now my car menu, between the KM/H and RPM clock, is in Dutch. Switching to English, German or Dutch works immediately.
Of course in the garage, the car is connected via OBD to some service device and they check and test "things". I have no idea whether that resetted something.
Just for clarity and completeness, I will display two images to show it has nothing to do with Android, but with the car menu itself which you access via SWC.
I will update above posts.
And I now see how much dust is on my Dashboard. Shame on me 🙂
The strange thing is though that when I reopen the Language Settings, or completely exit and reopen the app, there seems no language selected at all. The good thing is that it now simply works, although some texts are still in English (l/h, km/h, trip) but obviously they (VAG) think that Dutch people will understand.