What's the usual collaboration platform? frequent emails or google shared docs? What's you take on the language? French sounds good, after all we can translate later.
I just asked how soon they wanted it.

They also say 4000 characters is best.

Rien n'est gratuit en ce bas monde. Tout s'expie, le bien comme le mal, se paie tot ou tard. Le bien c'est beaucoup plus cher, forcement. Celine