Looks like a great localization resource: The Common Locale Data Repository Project already did the job of translating language and country names for you and me, and they're defining common date, time and currency formats per language/country. So if you need to know what's the Thai word for "Hungarian", just look here!

"The purpose of the Common Locale Data Repository project is to provide a general XML format for the exchange of locale information for use in application and system development, and to gather, store, and make available a common set of locale data generated in that format."