fix: incorrect french translation

[mrossard]

Those are 2 small changes :

• afaik "status" is not a valid french word ("statut" exists though), the usual translation for "HTTP status code" is "code d'état HTTP"
• The usual translation for "to attach a file" is "joindre un fichier", not "attacher un fichier"

I'm not sure how such changes are usually handled (if ever?), since they would break any tests relying on the faulty translations...?