I'm not using Netflix that long, so I'm not so good at it.
I'm in Turkey right now and wanted to download movies on the go, but unfortunately most are not in German (no German subtitles and audio).
Is that normal or is it because I'm in Turkey
Most likely because you are in Turkey
Because in every country where you have the Netflix offer is different, the languages are designed for the corresponding country.
There are certainly a few films that you can look in German or at least with subtitles, but you have to find it first.
Try to search for something German in the search function.
Hope I could help.
Can't you do anything against that?
You could download a VPN app (it pretends to be you, for example, in Germany) but I think they really have to work.