It is kinda hateful to translate .PO files from Traditional-Chinese to Simplified-Chinese, most of the meanings are identical but different in simplified word or traditional word. It is not a very difficult to translate. But however, it is still an hateful job to do that manually. For this reason, I wrote a tool which uses Google translate API to translate .PO files automatically. It is quite easy to install
It is also very easy to use, too.
po_translate input.po output.po zh-TW zh-CN
Of course, you can replace zh-TW and zh-CN to the source and destination language you like, e.g. English to Chinese, if the result is acceptable to you 🙂