This is a small library providing the ISO-639 language code to language name mapping.
After loading the library, simply use
names to retrieve the list of known names for a language code.
(language-codes:names :eng) ; => ("English") (language-codes:names :ht) ; => ("Haitian" "Haitian Creole")
You can also perform the inverse lookup, by
(language-codes:codes "english") ; => (:ENG :EN)