Open your game. You should have four options before the character select screen. Choose the 2nd one from the top. This should bring you to the settings menu. Once there, select the right-most tab. This should bring you to the "Misc" tab, where you should be able to choose your in-game language. Use the arrows next to the top box to find your preferred language, select it, then click OK (Use the provided screenshots if you don't know which one that is). Then, restart the game. After a restart, the game should be set to your preferred language.

Good luck.

https://imgur.com/a/Ft75hb5