feat(module:i18n): add Slovenian support, ICU locale sl_SI, #2545

[aleksander351]

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
[x] 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?

No support for slovenian language.
Issue Number: #2545

What is the new behavior?

Support for slovenian language.

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information

[netlify]

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[codecov]

Codecov Report

Merging #2652 into master will decrease coverage by 0.01%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           master   #2652      +/-   ##
=========================================
- Coverage   95.61%   95.6%   -0.02%     
=========================================
  Files         495     500       +5     
  Lines       12075   12089      +14     
  Branches     1687    1687              
=========================================
+ Hits        11546   11558      +12     
- Misses        169     170       +1     
- Partials      360     361       +1

Impacted Files	Coverage Δ
components/i18n/languages/time-picker/sl_SI.ts	100% <100%> (ø)
components/i18n/languages/calendar/sl_SI.ts	100% <100%> (ø)
components/i18n/public-api.ts	100% <100%> (ø)	⬆️
components/i18n/languages/pagination/sl_SI.ts	100% <100%> (ø)
components/i18n/languages/sl_SI.ts	100% <100%> (ø)
components/i18n/languages/date-picker/sl_SI.ts	100% <100%> (ø)
components/core/scroll/nz-scroll.service.ts	73.07% <0%> (-3.85%)	⬇️
... and 2 more

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