🇫🇷 French translation

Added french translations for a lot of messages (thanks Fabien) - 🇫🇷 Ajout de la traduction française pour beaucoup de messages (merci Fabien)

To contribute by adding more languages

• take english file
• and like french file, translate it and propose it to QMobileUI project into a qmobileui/src/main/res/value-<lang> folder