EMA

* adds Ema model (basically Compensation inherited)
* adds index view for EMAs
* fixes drop-down link bug for menu 'More' in navbar
* refactors some more forms to use process_request()
* adds modified attribute to BaseResource for easy last_modified check
* adds setting of modified attribute in all places where UserAction.EDITED is added to log
* adds EMA_ACCOUNT_IDENTIFIER_LENGTH and EMA_ACCOUNT_IDENTIFIER_TEMPLATE to ema/settings.py
* adds EmaAdmin to ema/admin.py
* fixes wrong title in intervention detail view html for revocations
* adds support for subtitle variable to BaseTable and generic_index.html
* drops next_version attribute from models
* adds/updates translations
* adds default ordering for UserActionLogEntry
   * removes extra ordering in log modal rendering

intervention/forms.py

@@ -203,6 +203,8 @@ class EditInterventionForm(NewInterventionForm):
                 action=UserAction.EDITED
             )
             self.instance.log.add(user_action)
+            self.instance.modified = user_action
+            self.instance.save()
 
         return self.instance
 
@@ -381,6 +383,8 @@ class NewRevocationForm(BaseModalForm):
                 document=document,
                 created=created_action,
             )
+            self.instance.modified = edited_action
+            self.instance.save()
             self.instance.log.add(edited_action)
             self.instance.legal.revocation = revocation
             self.instance.legal.save()
@@ -553,6 +557,8 @@ class NewWithdrawForm(BaseModalForm):
                 action=UserAction.CREATED
             )
             self.instance.log.add(user_action_edit)
+            self.instance.modified = user_action_edit
+            self.instance.save()
 
             # Create withdraw depending on Intervention or EcoAccount as the initial instance
             if self.is_intervention_initially: