How to Change your Language to Japanese in League of Legends (New Launcher)

Tutorial on how to change your language to Japanese in League on a new launcher, it works on any server, euw, eune, na and so on. It also changes everything from English to Korean, even voices from characters, etc. This is the latest How to change your Language to Japanese Guide for Season 10.
--locale=ja_JP
╳╳╳╳╳╳╳╳╳╳╳╳╳╳╳╳╳╳╳╳
❄️❄️Use Code "Anber" In the item Shop❄️❄️