Move link conversions, consolidate FrontPageLink with new link class

mayan/apps/navigation/classes.py

@@ -185,6 +185,11 @@ class Link(object):
         current_path = request.META['PATH_INFO']
         current_view = resolve(current_path).view_name
 
+        # Preserve unicode data in URL query
+        previous_path = smart_unicode(urllib.unquote_plus(smart_str(request.get_full_path()) or smart_str(request.META.get('HTTP_REFERER', reverse('main:home')))))
+        query_string = urlparse.urlparse(previous_path).query
+        parsed_query_string = urlparse.parse_qs(query_string)
+
         if self.permissions:
             try:
                 Permission.objects.check_permissions(request.user, self.permissions)