Published launch-language plan
The official FAQ lists English and Simplified Chinese for launch, with additional language support planned during Early Access in response to player demand.
Site language is not game language
A translated guide website does not prove that the game client has the same language option. Check the current store page and in-game language menu for the released build.
How to verify
Look for an official language list near purchase information, then confirm the selection inside the game. Update any personal recommendation when a patch changes that list.