Swahili translation locale.

[Tembocs]

What does this PR do?
This PR adds Swahili translation locale.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• [ x] New feature (non-breaking change which adds functionality)
• Maintenance change (non-breaking change such as upgrading a dependency, refactoring, or making a lint fix)
• Documentation update
• Breaking change (a fix or feature that would cause existing functionality to change)

Checklist

• Wrote additional tests, if needed
• [ x] All tests have passed, you can find the scripts from the ./bin folder
• I have updated the documentation accordingly, if needed.

Additional Information
Swahili is the commonest language used in East and Central Africa.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.46%. Comparing base (bbf07ee) to head (9964dda).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #270   +/-   ##
=======================================
  Coverage   96.46%   96.46%           
=======================================
  Files          36       36           
  Lines        1611     1611           
=======================================
  Hits         1554     1554           
  Misses         57       57           

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[jama5262]

@Tembocs Thanks for your contribution, looks like there are a few things missing 😅

1. Test
2. Updated documentation

Please use this guide on how to add a new local to Jiffy #231