CodePocket Info (Dota2)
For more information regarding a possible contribution the the app's codebase, go here
Pocket Info (Dota2) - to help translate the app, go here.
For more information about translations and supported languages, go here.
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.
The stats section - comes from OpenDota. If you encounter any translation problems with this section, you can help out here.