fix(module:i18n) add missing german translations

[gregorybleiker]

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?

[ ] 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: i18n

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

[zorro-bot]

This preview will be available after the AzureCI is passed.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.50%. Comparing base (55ed68a) to head (ca72bfe).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #8605      +/-   ##
==========================================
- Coverage   91.51%   91.50%   -0.02%     
==========================================
  Files         534      534              
  Lines       18425    18425              
  Branches     2905     2905              
==========================================
- Hits        16862    16859       -3     
- Misses       1243     1245       +2     
- Partials      320      321       +1     

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[Laffery]

LGTM