Pocket Info (Dota2) is Open Source. View license
The app's codebase is available on github.
The wiki data - comes from the game files, so the wiki translations are already made (but sometimes incomplete - i.e. patch notes).
If you'd like to help translating the Dota2 game itself, you can try enrolling with Steam Translation.
Even though Pocket Info (Dota2) is developed as a hobby, I did spend quite a lot of time developing and designing it well enough for both Apple and Google stores, as well as for you to have a better experience while using it.
If you'd like to buy me a beer, you can do that at: