Long story short: we do not use your data in any way that isn't absolutely required by any app feature. Les Joies de l'Étudiant Info does not (and won't ever) gather any personal information in any way.
Les Joies de l'Étudiant Info is an open-source application: you can browse its code an execute it on your device from GitHub, on the following URL: https://github.com/chteuchteu/Les-Joies-de-l-Etudiant-Info.
Here are the permissions required by Les Joies de l'Étudiant Info to work:
You can read the full permissions list from Les Joies de l'Étudiant Info's
AndroidManifest.xml on GitHub.
We do not collect any information that may identify you, or any other personal data through these services. Since Les Joies de l'Étudiant Info is an open-source application, you could clone its source code, get rid of these services and use it as-is if any of these ones bothers you.