Hi Daiki, The gettext manual includes a country code list (node Country Codes, file doc/iso-3166.texi). It's not up to date (in 0.18.3.2), for example, it does not include SS for South Sudan. I'm not sure if it's really a good idea for gettext to redundantly include these tables (ditto ISO 639), but either they should be removed or updated.
For the current list, the best place I know to look is https://en.wikipedia.org/wiki/ISO_3166-1_alpha-2 since ISO has unfortunately put their list behind a web registration (and I don't get the impression they provide the simple text list any more at all). best, karl
