CE4 Theme for WordPress is distributed in English, but contains the necessary strings for localization into other languages using the standard WordPress localization techniques. To get started, review the l18n information in the WordPress codex:
We've already done the “Marking Strings for Translation” bit, so you should only need to generate and translate the language files.
The Smashing Magazine article, Internationalizing And Localizing Your WordPress Theme, is also a good read on the subject, and you should be able to turn up additional information by Googling the search terms “wordpress theme localization”.
The Turning Gate
Creating webbly, wobbly, Lightroomy things since 2007.