French localization (gpt4All v3.6.1)

[Ilithy]

Describe your changes

Added localization of the gpt4All's interface into French.

File added:

• gpt4all_fr_FR.ts

Modified files:

• CMakeLists.txt
• mysettings.cpp
• roadmap.md
• MAINTAINERS.md

Issue ticket number and link

Checklist before requesting a review

• I have performed a self-review of my code.
• If it is a core feature, I have added thorough tests.
• I have added thorough documentation for my code.
• I have tagged PR with relevant project labels. I acknowledge that a PR without labels may be dismissed.
• If this PR addresses a bug, I have provided both a screenshot/video of the original bug and the working solution.

Demo

Notes

The only downside is the small display "bug" on the home page, the text "seems" too long, should I put the text on two lines instead of one or shorten the text?

If there is a necessary modifications, let me know, I will make the required changes.

Thank you.