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It's imho pretty easy to populate a database of language names, since ISO 639 has names already. Depending on the substandard (currently 1, 2B, 2T, 3, 5 plus 6 in preparation), we have English, French, and an autonym or several (name of a language name in the language itself) They are all available to more or less automatic bulk download. Since I've done that already seveal times, for my own tools, I'd be available to make the same for twn as well. I know there are few special cases with dropped codes and altered meanings, but the bulk is fairly easy. Btw., the Babel extension is doing something very similar already.