feat(datepicker): Added Slovenian locale support for datepicker

[mihan]

No description provided.

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (development@91ffd36). Click here to learn what that means.
The diff coverage is 24.28%.

@@              Coverage Diff               @@
##             development    #4035   +/-   ##
==============================================
  Coverage               ?   71.83%           
==============================================
  Files                  ?      254           
  Lines                  ?     8308           
  Branches               ?     1614           
==============================================
  Hits                   ?     5968           
  Misses                 ?     1894           
  Partials               ?      446

Impacted Files	Coverage Δ
src/locale.ts	100% <100%> (ø)
src/chronos/i18n/sl.ts	23.18% <23.18%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 91ffd36...331c0a4. Read the comment docs.

[valorkin]

• please add this language in docs
  so @YevheniiaMazur could test it
• and migrate tests too

[valorkin]

like here: #3991

[valorkin]

@mihan thanks for your help!
sorry for a delay, was busy with organizing https://ngtalks.io