changing the language in the newest lol client

hello, im writing this because i need help , here is the problem - i play on EUNE server but i wanted to change my language from english to deutsche. here is the question, why cant i change the language like that? i mean , every other game has that option and i think its a bit stupid . either way , i tryed to look it up on the internet but every method with going into lols config doesnt seem to work with the new client. now the real question - do somebody know how to change languages in the new client like that?

We're testing a new feature that gives the option to view discussion comments in chronological order. Some testers have pointed out situations in which they feel a linear view could be helpful, so we'd like see how you guys make use of it.

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