try change in manually by going on https://codecombat.com/play/dungeon
then click this button:
after that, click your hero, then on the left bottom corner it should say this:
then click on it, and select your language, then open up whatever level or multiplayer you want.
if that does not work, click on zero sum, and when you choose your gear, click the button that says “choose hero or language”
Hello, you can change the language by going to the world home and clicking the hero bar, but you can also click game options and click select heroes and change it in the level there.