Currently, http://support.atlassian.com is running under Tomcat web application server and it's configured with UTF-8 encoding. However, http://confluence.atlassian.com is running under Resin and the URIEncoding is omitted. That's why the browser is not decoded properly when accessing http://confluence.atlassian.com Detailed explanation for this issue described here:

• http://yi.wiktionary.org/wiki/project:l%C9%9B%CA%81i_%D7%9C%D7%A2%D7%A8%D7%99_%D7%A8%D7%99%D7%99%D7%A0%D7%94%D7%90%D7%A8%D7%98/support.atlassian.com/CSP-14385?uselang=en#globalWrapper