If it's the same as the big X10, go to settings (menu button and select the bottom right on-screen button with the screwdriver and spanner). Then go to the 11th option from the top, which in English is 'Locale and text). Tap on the top option and you will see a list of options for language, all written in the language the phone will be used in. For example, the the top one is English (United States). Select the one you want and all will be well again.
Hope this helps!
