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

user/models.py

@@ -74,6 +74,11 @@ class UserActionLogEntry(models.Model):
     )
     comment = models.CharField(max_length=255, null=True, blank=True, help_text="Additional comment on this entry")
 
+    class Meta:
+        ordering = (
+            "-timestamp",
+        )
+
     def __str__(self):
         return "{} | {} | {}".format(self.user.username, self.timestamp, self.action)