WIP: Add French translations for Project and Repository pages

What does this MR do?

This MR add French translation for all translated page in the 9.3 milestone.

Are there points in the code the reviewer needs to double check?

The translation still needs a second check, and some are still fuzzy. Still, I created this WIP merge request as a PoC and RFC for this feature

Why was this MR needed?

In order to add French localisation to Gitlab.

Screenshots

No screenshot yet, but SOON.

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Documentation created/updated
• API support added
• Tests
  • Added for this feature/bug
  • All builds are passing
• Conform by the merge request performance guides
• Conform by the style guides
• Branch has no merge conflicts with master (if it does - rebase it please)
• Squashed related commits together

What are the relevant issue numbers?

See #32919 (closed)
Closes #32998 (closed)
Closes #33140 (closed)