The [b]chinese[/b] tab in the [u]custom[/u] page under [b]model [/b] is my own way to translate strings into Chinese.
You can remove
public void zh_tw(){
... // and every code in between

but you also need to remove
if(type.equals("zh_tw"))zh_tw(); [/code]

Then, it should work fine. The problem might due to the Chinese character code in the program, and you java version (OS) did not recognize it.