How to change the language of the playstore on android phone (samsung galaxy S4) or at least of applications
You can change the system language by goint to Settings > Language &amp; Input > Language and selecting English (UK or USA, as you wish).

En français, ça se situe dans Paramètres > Langue et saisie > Langue.

But be aware : by the changing the system language, every applications will be changed to that language.