So here we start -
1. From the standby screen, tap Menu.
2. Select Settings.
3. Scroll down to General, and Select General
4. Select Language.
5. Select Display.6. Now choose the desired language you wish to use by tapping on it. Scroll up and down the screen to see all available languages
Note: you may take help of pictures , if you cant read / understand the originally set language on the phone...