Better tw translations

Also, http://5stardata.info/tw/ is showing as garbled character in some browsers, because of the `Content-Type: text/html` header perhaps needs to be `Content-Type: text/html; charset=utf-8` instead — in `httpd.conf` one can say `AddDefaultCharset utf-8` to fix that.

I tried fixing this using HTML5 `meta charset` head element.