AmigaOS needs these files before you can select Taiwan & Taiwanese from the Locale preferences
In order to create those files some information is needed in Taiwanese, like the month names and week day names, and some general information about Taiwan.
Try sending a private message to Cyborg
(he is one of the core developers) and ask if he can create the files. He is also the person who you should contact, if you would like to be a translator.