You can change the language by going to the "Menu" on the left and tapping "Language".
There are 32 different languages for you to choose from: Arabic, Chinese (Simplified), Chinese (Traditional), Croatian, Czech, Danish, Dutch, English, Finnish, French, German, Hebrew, Hindi, Hungarian, Indonesian, Italian, Japanese, Korean, Malay, Norwegian, Persian/Farsi, Polish, Portuguese, Romanian, Russian, Slovak, Spanish, Swedish, Thai, Turkish, Ukrainian, Vietnamese.
If you don't find the language of your choice on the list, it means the app hasn't yet been translated to that language.