Added: Bulgarian Language

[MrEddX]

Description

Bulgarian language and locale added.

Type of change

• 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)
• Documentation update

How has this been tested

• I have run bash ./tools/deploy.sh --dry-run (at the root of the project) locally and passed
• I have tested this feature in the browser
• Tested by deploying a website on GitHub Pages
• CI/CD with no errors

Test Configuration

• Browser type & version: Brave 1.39.122
• Operating system: Windows
• Ruby version:
• Bundler version:
• Jekyll version:

Checklist

• I have performed a self-review of my code
• I have commented on my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings