Removing pl-PL translation until we have a maintainer

[tadeubas]

Description

• Removes pl-PL translations. If a user had selected that locale, it defaults to en-US.
• Created checks for Category and Number Settings to ensure that wrong stored configs doesn't broke functionalities.

What is the purpose of this pull request?

• [ ] Bug fix
• [ ] New Feature
• [ ] Documentation update
• [x] Other

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 94.21%. Comparing base (04e7cca) to head (ea6cf56). Report is 5 commits behind head on develop.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #447 +/- ## =========================================== - Coverage 94.21% 94.21% -0.01% =========================================== Files 59 59 Lines 7245 7259 +14 =========================================== + Hits 6826 6839 +13 - Misses 419 420 +1 ```

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[odudex]

Thank you! Great work on settings and tests!