Hello,
Pronote as of now is available in English! I was skeptical and even had the same problem, but luckily enough, the platform (both web and mobile) is available in English. All you have to do is (assuming your language is set to French right now):
- Go to Mes Données, in the top right corner in the web version and on the hamburger menu on mobile
- Click on "Style et Accesabilité"
- Under "Personnalisation", there is "Langue", there, click on "English"
Now you'll have to confirm to reload the page, say "Oui", and there you go!
However, if what you are talking about is the language of the assignments and texts added by teachers, then I suggest using a browser with a built-in translator, which would translate everything.