Earlier quoted context omitted.
The client is French. Including a French copy of the message is entirely mundane.
The French invented the word chauvinism :) They take their language very seriously likewise. I work for a French company and even though the official language is English you're kind of a second rate citizen if you don't speak it. Or write last names in all caps or quotation marks like > :) They just are that way :P
Try to not speak English in a US company, I guess?