feat: Complete the French (Français) translation of Puter #975

[HatemLamia]

Completed the French translations of Puter #975

[CLAassistant]

All committers have signed the CLA.

[jelveh]

Hey @HatemLamia, thank you for you contribution.
I use AI to quality-check translation. Here's Claude told me:

A few suggested improvements:

"billing.upgrade_to_pro" uses "%strong%" awkwardly - consider "Passer à la version %strong%" instead
"billing.apps_and_games" - "Jeux" should be lowercase when following "&"
"billing.cancel_it"/"billing.keep_it" - "L'/Le" pronouns feel unnatural, simply use "Annuler"/"Garder"
"billing.accelerated" - "Optimisé" might be more appropriate than "Accéléré" in a business context

Otherwise, the translations maintain consistent tone and terminology throughout the billing interface context.

Is any of this something we should look into?

[HatemLamia]

Hi @jelveh,
Could you please review my pull request? Thank you!