Add Finnish translations to translations.php

[akkinyu2002]

Description

Fixes #

Type of change

• Bug fix (added a non-breaking change which fixes an issue)
• New feature (added a non-breaking change which adds functionality)
• Updated documentation (updated the readme, templates, or other repo files)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

How Has This Been Tested?

• Tested locally with a valid username
• Tested locally with an invalid username
• Ran tests with composer test
• Added or updated test cases to test new features

Checklist:

• I have checked to make sure no other pull requests are open for this issue
• The code is properly formatted and is consistent with the existing code style
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings

Screenshots

[akkinyu2002]

I added the Finnish

[Copilot]

Pull request overview

Adds a new Finnish (fi) locale to the project’s translation map so the streak stats UI strings can be displayed in Finnish.

Changes:

• Added a new fi translation array in src/translations.php.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

You can also share your feedback on Copilot code review. Take the survey.

[akkinyu2002]

@copilot open a new pull request to apply changes based on the comments in this thread