CRM 2011 Personal Options: Change your language
It's easy to have all the forms, menus, labels and even the help files in CRM display in one of up to 41 languages!
Navigate to Tools > Options
Click on Languages and select the languages you want for the UI and the Help files from the drop downs. (If the language you're looking for is not there, ask your system administrator to enable it using the directions found here.)
Below you can see the updated menus and help files all updated from English to Spanish.