You have to encode special characters before using in URL. Here is online tool for URL encoding www.url-encode-decode.com (don't forget to select correct encoding, utf-8 or another)
←→
after url encoding: %E2%86%90%E2%86%92
and there's no need to specify the subset=
parameter when using text=
.
Here is final, cross-browser solution http://jsfiddle.net/Praak/2/