[{quoted}](name=WHL Mythix,realm=EUW,application-id=3ErqAdtq,discussion-id=kRhFQeli,comment-id=00010000,timestamp=2019-07-17T14:41:41.568+0000)
I genuinely think this wouldn't work but I guess my point is invalid now. Thank you very much!
You can change the game's language by the ways suggested by ShirarezaruEiyuu. Unless Riot made moves to remove it, it's how it has always worked.
The only issue is that it uniformly change both the audio and text language of the client. You can't for instance, use the English text, and French audio if that's what you prefer.
Honestly, there is no reason not to allow any of this. There is no reason why the players have to fiddle with the txt file (and gambling with your chances of being banned whenever Riot decides it's not allowed anymore and is now considered game file editing) to change the language of one of THE most played game ever made like League, and not even that, there is no separate language option for audio and text.
Apparently in 2019, Riot as one of the most successful game company to ever exist still has no concept of a language option in the game. You'd think that should only be a thing for indie devs who perhaps have not enough resource to bother with more detailed language options, but no, we're talking about League.