Broken issues sort URL when trying to sort search results with cyrillic letters in search query. (BB-10266)

For example, if I try to search issues containing "тест" (in Russian)

https://bitbucket.org/site/master/issues?q=%D1%82%D0%B5%D1%81%D1%82

I get normal search results. But when I try to sort them by status after that, I get broken URL (no & symbol between search text and 'sort' param name):

https://bitbucket.org/site/master/issues?q=%D1%82%D0%B5%D1%81%D1%82sort=-status

Screenshot attached.

Tested in Firefox 27.0.1