Emacs can be used with a variety of languages other than English. Mule, or the Multilingual Environment, is packaged with emacs on Athena, and can be accessed under the Options > Mule (Multilingual Environment) submenu.
To start inputting in a different language, you will first need to set the language environment in the Mule menu and then toggle to the desired input method. Some useful key bindings that might help (these commands are also accessible through the Mule menu):
|C-\||Toggle input method (usually between English and the foreign language you selected)|
|C-h I||Describe input method (displays the keyboard layout for an input method)|