Translations moved into their own files

[simon-leech]

Description

All translations are now provided in their own language file, rather than being merged in within various modules.

GitHub Issue

#1449

Testing Checklist

Please delete options that are not relevant, and select all options that apply.

• ✅ Existing Tests still pass
• ✅ Updated Existing Tests
• ✅ New Tests Added
• ✅ Ran locally on my machine

Code Quality Checklist

Please delete options that are not relevant, and select all options that apply.

• ✅ My code follows the guidelines of XYZ
• ✅ My code has been commented
• ✅ Documentation has been updated
• ✅ New and existing unit tests pass locally with my changes
• ✅ Main has been merged into this PR