The famous program Language Enabler to add lost language from your phone without root.

Does your phone not have your country's language, or do you want to change the whole language to another language that isn't on the phone?

1.Go to Settings

2.Scroll down to the bottom and tap About phone

3.Find and tap Software information

4.Locate the Build Number field and Tap the Build number field seven times, to enable Developer Options. When you are done, you'll see the message Developer mode has been enabled. Go back to the settings, scroll down to the bottom and you'll see the Developer options menu. Now, you can enable USB Debugging mode: In Settings menu, go to Developer Options, scroll down find USB Debugging and enable it.

5.Enable USB Debugging and you will get RSA Key Notification

6.Select Always allow from this computer, and tap OK

now connect your phone and open the program wait for 7 sec and you will see the app in phone