feat(locales): add Greek (el-GR) and Romanian (ro-RO)

[kmoutzou]

Datepicker localization in Greek language.
Datepicker localization in Romanian language.

What kind of change does this PR introduce?

What is the current behavior?

What is the new behavior?

Checklist:

• Documentation
• Tests
• Ready to be merged

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[kmoutzou]

@JorgenVatle hello, please if possible, merge the localization changes i added for Romanian and Greek languages. I have no idea why the pull request does not get accepted by the automatic system, the changes are very simple json changes, nothing it should have issues with..

[JorgenVatle]

I don't believe I have permission to merge, but the changes look good to me. 👍

[kmoutzou]

Thanks for quick response! Sorry, i thought u had permissions, maybe @arthurdenner then?

[codecov]

Codecov Report

Merging #650 (8005c60) into develop (8407575) will increase coverage by 0.04%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop     #650      +/-   ##
===========================================
+ Coverage    95.37%   95.41%   +0.04%     
===========================================
  Files           16       16              
  Lines          519      524       +5     
  Branches        99      100       +1     
===========================================
+ Hits           495      500       +5     
  Misses          24       24              

Impacted Files	Coverage Δ
src/index.tsx	94.05% <0.00%> (+0.03%)	⬆️
src/utils.ts	98.14% <0.00%> (+0.14%)	⬆️

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[arthurdenner]

@kmoutzou, thank you for your contribution.
You'll be notified here when this PR is released.

Please keep in mind that every person has different availability.

[github-actions]

🎉 This PR is included in version 2.15.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot 📦🚀

[arthurdenner]

@allcontributors please add @kmoutzou for code.

[allcontributors]

@arthurdenner

I've put up a pull request to add @kmoutzou! 🎉