Add german as a language

- Add german as a language
- Add German as a menu option:
<img width="2239" alt="Bildschirmfoto 2022-10-20 um 17 03 02" src="https://user-images.githubusercontent.com/115980888/196985890-4c141923-032a-453e-bf23-74eba6c22a95.png">
