fix(module:i18n): add missing translations to sk_SK

[vmasek]

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: added missing translations

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.12%. Comparing base (b0a4287) to head (bccc11c).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff            @@
##           master    #9335    +/-   ##
========================================
  Coverage   92.12%   92.12%            
========================================
  Files         561      561            
  Lines       19631    19631            
  Branches     3107     3000   -107     
========================================
  Hits        18086    18086            
  Misses       1206     1206            
  Partials      339      339            

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[Laffery]

LGTM