Add Locale Tests

[ABolouk]

Pull Request Checklist

Thank you for taking the time to improve Arrow! Before submitting your pull request, please check all appropriate boxes:

• [x] 🧪 Added tests for changed code.
• [x] 🛠️ All tests pass when run locally (run tox or make test to find out!).
• [x] 🧹 All linting checks pass when run locally (run tox -e lint or make lint to find out!).
• [x] 📚 Updated documentation for changed code.
• [x] ⏩ Code is up-to-date with the master branch.

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Description of Changes

Closes: #1022

Added test cases for the languages that were not in in the test_locale file based on their related Locale class data.

[codecov[bot]]

Codecov Report

:white_check_mark: All modified and coverable lines are covered by tests. :warning: Please upload report for BASE (master@edfff3c). Learn more about missing BASE report. :warning: Report is 2 commits behind head on master.

Additional details and impacted files

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  Files             ?        10           
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  Hits              ?      2315           
  Misses            ?         0           
  Partials          ?         0           

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[ABolouk]

I just want to mention for Romansh and Catalan languages although there are translation for "week" and "weeks" but it seems that they can not generate translation for "weeks". I removed the tests related to "weeks" for these two so that there wouldn't be a test for something not implemented. I would be glad to know if this is okay or do I need to add them.

Thank you.

[jadchaar]

Hey @ABolouk, mind fixing the linting as well?