Call Me Fishmeal.: Pimp My Code, Part 17: Lost in Translations.
http://wilshipley.com/blog/2009/10/pimp-my-code-part-17-lost-in.html

So, use icons whenever possible on buttons, and if you must use text

Nice piece by Wil Shipley on localizing Cocoa apps, including his own clever technique for doing so without maintaining separate XIB files for each separate localization.