https://bugzilla.redhat.com/show_bug.cgi?id=1001446
--- Comment #3 from Steve Tyler stephent98@hotmail.com --- OK, zh_TW is in langtable with the name "Traditional Chinese (Republic of China)":
$ less -N langtable-0.0.11/data/languages.xml ... 21270 <language> 21271 <languageId>zh_TW</languageId> ... 21275 <names> 21276 <name><languageId>de</languageId><trName>Traditionelles Chinesisch (Taiwan)</trName></name> 21277 <name><languageId>en</languageId><trName>Traditional Chinese (Republic of China)</trName></name> ... 21284 </names> 21285 <locales> 21286 <locale><localeId>zh_TW.UTF-8</localeId><rank>1000</rank></locale> 21287 </locales> ... 21300 </language> ...