Choose the language of a Booking Page

I need to be able to define the language of a Booking page.

Currently the "no availability text", as well as months and days are in English.

My audience is speaking French and I need to have my booking pages in that language as well.

This should be a parameter of a Booking page.
Indeed, I like to have my Ontraport profile in English for ease of communication with support & community, but all the pages related to my audience & customers must fully be in French.