Back from the road. The good news is, waze does work now in english language. Well, mostly - it guided me correctly for 90 km and back home with its english voice and crashed only once when I left the route on purpose.

Bad news is, there is no chance to change the language settings to German. The attempt to do so leads to a dumb waze again while the lettering within the program does switch to german.

Could there be something wrong in the ./waze/tts directory? I find one file there called voices_was_tts.csv which contains two lines only - maybe there should be more?

Anyway, I will leave the voice set to English now as waze does work that way. It is not perfect, but better than nothing. I wonder if users in other countries have similar experiences?

Oh, and I should perhaps try to change the language to - let's say French - might that lead to another result?