diff --git a/combo/apps/maps/manager_views.py b/combo/apps/maps/manager_views.py
index b7e1f36b..f3c29fe3 100644
--- a/combo/apps/maps/manager_views.py
+++ b/combo/apps/maps/manager_views.py
@@ -82,7 +82,7 @@ class MapCellAddLayer(CreateView):
         PageSnapshot.take(
             self.cell.page,
             request=self.request,
-            comment=_('added layer "%s" to cell "%s"') % (form.instance.map_layer, self.cell))
+            comment=_('added layer "%(layer)s" to cell "%(cell)s"') % {'layer': form.instance.map_layer, 'cell': self.cell})
         return super(MapCellAddLayer, self).form_valid(form)
 
     def get_success_url(self):
@@ -121,7 +121,7 @@ class MapCellEditLayer(UpdateView):
         PageSnapshot.take(
             self.cell.page,
             request=self.request,
-            comment=_('changed options of layer "%s" in cell "%s"') % (form.instance.map_layer, self.cell))
+            comment=_('changed options of layer "%(layer)s" in cell "%(cell)s"') % {'layer': form.instance.map_layer, 'cell': self.cell})
         return super(MapCellEditLayer, self).form_valid(form)
 
     def get_success_url(self):
@@ -155,7 +155,7 @@ class MapCellDeleteLayer(DeleteView):
         PageSnapshot.take(
             self.cell.page,
             request=self.request,
-            comment=_('removed layer "%s" from cell "%s"') % (self.object.map_layer, self.cell))
+            comment=_('removed layer "%(layer)s" from cell "%(cell)s"') % {'layer': self.object.map_layer, 'cell': self.cell})
         return response
 
     def get_success_url(self):