Oh, this is simple! :)

First, tap on the settings button (the gear icon) on the right upper corner.

Then simply select region and you'll see a dropdown with all language options that the game is available in.
Tap that button and select the language that fits you better and finally click on "Confirm"!

The game will reload and your new language should be set! :)

If you have any issues to do this, please, check our article "How to contact us" and send us a report!