Invert Action Object and Target columns

Signed-off-by: Roberto Rosario <roberto.rosario.gonzalez@gmail.com>

HISTORY.rst

@@ -273,6 +273,8 @@
   files.
 * Place deletion policies units before periods for clarity.
 * Remove repeated EMAIL_TIMEOUT setting.
+* Invert order to the Action Object and Target columns for
+  clarity.
 
 3.1.11 (2019-04-XX)
 ===================

mayan/apps/events/apps.py

@@ -48,11 +48,11 @@ class EventsApp(MayanAppConfig):
             func=widget_event_type_link, label=_('Event'), source=Action
         )
         SourceColumn(
-            attribute='action_object', label=_('Action object'), source=Action,
+            attribute='target', label=_('Target'), source=Action,
             widget=ObjectLinkWidget
         )
         SourceColumn(
-            attribute='target', label=_('Target'), source=Action,
+            attribute='action_object', label=_('Action object'), source=Action,
             widget=ObjectLinkWidget
         )