🐛 FIX: Update French Traduction

[leknoppix]

Description

I wanted to inform you that I have made some modifications and additions to the French translations for the project. These changes include correcting some translation errors and adding new strings that were previously untranslated. I hope these updates will improve the user experience for French speakers.

Feel free to provide feedback or suggest further improvements.

Thank you for your attention!

Checklist:

• [X ] I have read the Contribution Guidelines
• [ X] I have performed a self-review of my own code
• [X ] I have commented my code, particularly in hard-to-understand areas
• [ X] My changes generate no new warnings

Contributor License Agreement

By submitting this pull request, I acknowledge and agree that my contributions will be included in Stirling-PDF and that they can be relicensed in the future under the MPL 2.0 (Mozilla Public License Version 2.0) license.

(This does not change the general open-source nature of Stirling-PDF, simply moving from one license to another license)