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

ema/filters.py

@@ -0,0 +1,53 @@
+"""
+Author: Michel Peltriaux
+Organization: Struktur- und Genehmigungsdirektion Nord, Rhineland-Palatinate, Germany
+Contact: michel.peltriaux@sgdnord.rlp.de
+Created on: 19.08.21
+
+"""
+from django.db.models import QuerySet
+
+from compensation.filters import CompensationTableFilter
+
+
+class EmaTableFilter(CompensationTableFilter):
+    """
+    Since EMA and compensation are basically the same, we can reuse CompensationTableFilter and extend the MAE filter
+    in the future by inheriting.
+    """
+
+    def _filter_show_all(self, queryset, name, value) -> QuerySet:
+        """ Filters queryset depending on value of 'show_all' setting
+
+        Args:
+            queryset ():
+            name ():
+            value ():
+
+        Returns:
+
+        """
+        if not value:
+            return queryset.filter(
+                users__in=[self.user],  # requesting user has access
+            )
+        else:
+            return queryset
+
+    def _filter_show_recorded(self, queryset, name, value) -> QuerySet:
+        """ Filters queryset depending on value of 'show_recorded' setting
+
+        Args:
+            queryset ():
+            name ():
+            value ():
+
+        Returns:
+
+        """
+        if not value:
+            return queryset.filter(
+                recorded=None,
+            )
+        else:
+            return queryset