fix(module:18n): adding new translations de_DE

[prichter98]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/NG-ZORRO/ng-zorro-antd/blob/master/CONTRIBUTING.md#commit
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

[x] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[ ] Documentation content changes
[ ] Application (the showcase website) / infrastructure changes
[ ] Other... Please describe:

What is the current behavior?

Issue Number: N/A

What is the new behavior?

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information

[codecov]

Codecov Report

Merging #6434 (b76139f) into master (2fbbe94) will increase coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #6434      +/-   ##
==========================================
+ Coverage   89.82%   89.83%   +0.01%     
==========================================
  Files         478      478              
  Lines       15295    15295              
  Branches     2469     2469              
==========================================
+ Hits        13739    13741       +2     
+ Misses        937      936       -1     
+ Partials      619      618       -1     

Impacted Files	Coverage Δ
components/core/util/text-measure.ts	91.30% <0.00%> (+1.73%)	⬆️

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[Airblader]

Being a native German speaker myself I can confirm that these are correct.