What do you mean by the starting screen? Do you mean the language chooser, the main menu, or something else?
The code for choosing your language isn't working on your phone for whatever reason. I'm not sure what the issue as it works just fine on my Android device. I can only suggest that you delete the game and redownload it, and if it still doesn't work you'll either have to play it on a PC/laptop (if you have one) or give the game a miss.