[webui] Make group request datatables work

for groups with a dot in the title.
Fix #4021.

src/api/config/routes.rb

@@ -354,7 +354,7 @@ def self.public_or_about_path?(request)
     end
 
     controller 'webui/groups/bs_requests' do
-      get 'groups/(:title)/requests' => :index, as: 'group_requests'
+      get 'groups/(:title)/requests' => :index, constraints: {:title => /[^\/]*/}, as: 'group_requests'
     end
 
     controller 'webui/users/rss_tokens' do