bbPress.org

Bonjour,
As you can see all standard bbPress messages are translated (Favori, me désabonner, modifier, fermer) so you correctly got the French bbPress.
The ‘Block User’, ‘Add User’, etc is being added by an extra plugin or theme that you have, so you need to get that plugin translated into French. If you let me know here what plugin that is we can check together to see how it can be translated.
BàV, Pascal.