feat(translation): add French language translations

[Infuseting]

• Added complete French (fr) translation for all UI strings
• Updated language selector to include French

Describe Your Changes

just french translation

Fixes Issues

• Closes #
• Closes #

Self Checklist

• [ ] Added relevant comments, esp in complex areas
• [ ] Updated docs (for bug fixes / features)
• [ ] Created issues for follow-up changes or refactoring needed