Changing the language one Nokia Lumia 920 is actually very simple. You can choose between wide varieties of language for your keyboard.
Here’s your instruction:
1. From the start screen, slide to the App list, then tap Settings.
2. Choose Keyboard > Add keyboards.
3. Select a language you'd like to be able to use from your keyboard, and then tap Yes. (In order to remove languages that you don’t use any longer, press and hole the language and then click remove).
4. Tap Restart phone to use new-installed language on keyboard when you writing message.
Switch between languages when writing:
At the keyboard, you need press the language button until the language you want is shown, and then select yours to continue write message.