Please add a Game Language Change Option?

If there is already a way to do this will someone please let me know?

I think Riot really needs to add a language change option for the client. and game. It is very frustrating that there is no easy way to change your client language. At least, there is not one that I know of. I've looked up how to do it on Youtube but all i get is stuff that requires to download certain addons and whatnot that only end up working once.

I do not know why this is not currently in the game or client but I really think it needs to be. If there is some technical aspect or reason why this is not currently a thing will someone tell me?