Nope, doesnt matter.
What does matter is how well you can speak English, so if you are worried at all, get the school to organize the English Proficiency test for you so that you can be certified as competent in both English and French.
I would, however, study in both English and French; because there are not many operators who are forgiving for not understanding basic IFR procedures and "I learned them in French, not English" is only going to have you seeing the exit interview, not the cockpit.