Add German translation

[erri120]

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[codecov]

Codecov Report

Merging #723 (26590ea) into main (fc5a42a) will increase coverage by 65.16%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##           main     #723       +/-   ##
=========================================
+ Coverage      0   65.16%   +65.16%     
=========================================
  Files         0      558      +558     
  Lines         0    17467    +17467     
  Branches      0     1225     +1225     
=========================================
+ Hits          0    11382    +11382     
- Misses        0     5763     +5763     
- Partials      0      322      +322     

Flag	Coverage Δ
Linux	64.32% <ø> (?)
Windows	64.15% <ø> (?)
clean_environment_tests	65.13% <ø> (?)

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see 558 files with indirect coverage changes