The below tutorial is based on app player version 0.9.3.4070 and later which guides you to change the language IME of the keyboard on the app player.
1. On the home screen click on the All Apps channel.
2. Under 'All apps' section, click on “Select IME” app.
3. All the languages present in the app will be displayed.
4. Select the language you want use and install.
5. After installing the app from the app player, ‘Enable’ the language input.
6. Select the language input.
7. Now a pop-up will appear which shows the following option in the image below. Switch Off the physical keyboard.
8. Select the language input option.
9. Now check the keyboard language.