Miscellaneous Things You Need to Know About Macs
You can change your Mac's preferred language.
To change your computer’s preferred language, choose System Preferences from the Apple menu and select Language & Text (called International in older versions of OS X). Click the Language tab. Drag the language you want to use for application menus, dialogs, and so on to the top of the language list.
Next, click the Region tab to choose the region you live in; customize dates, time, calendar, and native currency; or decide whether to go metric or use the U.S. system of measurement. If you also click the Input Sources tab, you can choose a different keyboard layout, such as Chinese Wubi Xing or Hangul (Korean).