Description of problem:

In https://bugzilla.redhat.com/show_bug.cgi?id=1251356, the group page is ported to Backbone. It supports to have a group name containing slash '\' and the group url path will contain %2f which is an escaped '/' which will cause 404 error. This is because of a limitation in WSGI(https://github.com/mitsuhiko/flask/issues/900). 


Version-Release number of selected component (if applicable):


How reproducible:

Always

Steps to Reproduce:
1. Update a group name with '/'
2. Go to this group page

Actual results:

404 Not Found 

Expected results:

The page can be loaded successfully.