add Greek (Ελληνικά) locale

[jimfilippou]

New Pull Request

Add Greek locale.

Fixes # (issue)

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

[junedchhipa]

No translations for Selection and Selection Zoom? 😀

[jimfilippou]

You can say one thing in 100 ways using the Greek language, I have updated the translations.