Unicode character link handling issue on Activity widget

[levinng]

A blog post link to

"​http://domain.com/blog/%e4%bd%bf%e7%94%a8%e6%95%99%e5%ad%b8/%e5%a6%82%e4%bd%95%e5%88%a9%e7%94%a8rss%e5%be%97%e7%9f%a5%e7%ab%99%e5%85%a7%e6%9b%b4%e6%96%b0"

� Character appears on actual link, however the link still reachable.

Example:
levin wrote a new blog post: 如何利用rss得知站內更新 27 minutes ago

the link "如何利用rss得知站內更新" is link to ​http://domain.com/blog/使用教�/如何利用rss得知站內更新

which � is suppose to be a valid zh_TW chinese character "學".

[levinng]

A new ticket submitted by andrepan have a better description and screenshot, please refer to

​http://trac.buddypress.org/ticket/1326