Can't change the launcher's language

As the title says, everytime I open the launcher is in my native language (spanish) but I want it in English (also the game). The problem is that if I change the language from Spanish to English and launch the game, it opens up in Spanish. I close the game, open the launcher again and now it's back in Spanish, opening the game itself in English.
This shit's confusing AF and I'm tired of it, I WANT ENGLISH IN EVERYTHING. How can I do that? Thanks

/ignored