The translating part is by far the hardest. But there are services to organize a crowd sourced translations of your app / service. Booth android and iOS app bu

The translating part is by far the hardest. But there are services to organize a crowd sourced translations of your app / service. Booth android and iOS app building frameworks will try to force you into using variables for every rendered string (allowing you to change them easily and in one place - f.ex. based on user / device settings).