add german translation (formal and informal)

[Cube707]

I also posted on the community forum, post is currently under review

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.33%. Comparing base (d1411ab) to head (2673c4a).
⚠️ Report is 21 commits behind head on develop.

Additional details and impacted files

@@              Coverage Diff              @@
##             develop     #102      +/-   ##
=============================================
- Coverage     100.00%   97.33%   -2.67%     
  Complexity        19       19              
=============================================
  Files              2        2              
  Lines             48       75      +27     
=============================================
+ Hits              48       73      +25     
- Misses             0        2       +2     

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