handle new language tags with no iso639-3 yet
handle new language tags with no iso639-3 yet

sillsdev/libpalaso,gmartin7/libpalaso,sillsdev/libpalaso,gmartin7/libpalaso,gmartin7/libpalaso,ermshiperete/libpalaso,sillsdev/libpalaso,ermshiperete/libpalaso,ermshiperete/libpalaso,sillsdev/libpalaso,ermshiperete/libpalaso,gmartin7/libpalaso