pull-requests: also expose universal url as singular form.

rhodecode/config/routing.py

@@ -624,9 +624,11 b' def make_map(config):'
             'pull_requests_global_0', '/pull_requests/{pull_request_id:[0-9]+}',
             action='pull_requests')
         m.connect(
-            'pull_requests_global', '/pull-requests/{pull_request_id:[0-9]+}',
+            'pull_requests_global_1', '/pull-requests/{pull_request_id:[0-9]+}',
             action='pull_requests')
-
+        m.connect(
+            'pull_requests_global', '/pull-request/{pull_request_id:[0-9]+}',
+            action='pull_requests')
 
     # USER JOURNAL
     rmap.connect('journal', '%s/journal' % (ADMIN_PREFIX,),