Q: My Brother accidentally changed the language to Spanish and locked his IPad. It won't accept his password now?

You will need to restore your device using the computer with which you last synced it. This allows you to reset your passcode and resync the data from the device (or restore from a backup).

If you restore on a different computer that was never synced with the device, you will be able to unlock the device for use and remove the passcode, but your data will not be present.

You may have to force iPad/iPod into Recovery Mode

http://support.apple.com/kb/ht1212

Change the language back.  If you don't understad the settings in order to do this because they are in Spanish, see this article: http://support.apple.com/kb/HT2371.

Hi,

The password isn't language dependent, so don't translate it, please, but use it as before.

What password?  If you mean the passcode, that's a number

OK, then you'll need to back it up and restore it using iTunes on the last computer it was synced with, as posted earlier.

You are most welcome

You're welcome.