Thanks for reaching out. I went through your store and it appears that the only french words that remain are within your header menu. When your store was initially set up in French, it was likely that you gave these menu items the French version of the word or it populated the French version.
What you will need to do is go into your admin and click on Online Store > click Navigation underneath > Click on the Menu you want to edit on the right (likely called Menu Principal) > Click the edit button on each menu item to change it from 'Catalogue' to something like 'Shop Now' and 'Accueil' to 'Home'.
Let me know if that helps! If there is anything else I can help you with, please let me know.