improve managemails app

- add managemails.apps to give a more meaningful title in the admin site
- add verbose names to MailAddressMailbox fields
- implement managemails.models.Mailbox.get_mailaddresses and a corresponding
  property mailaddresses

gnuviechadmin/managemails/models.py

@@ -63,7 +63,7 @@ class MailboxManager(models.Manager):
 
 
 @python_2_unicode_compatible
-class Mailbox(ActivateAbleMixin, TimeStampedModel, models.Model):
+class Mailbox(ActivateAbleMixin, TimeStampedModel):
     """
     This is the model class for a mailbox.
 
@@ -96,6 +96,18 @@ class Mailbox(ActivateAbleMixin, TimeStampedModel, models.Model):
         delete_file_mailbox.delay(self.osuser.username, self.username).get()
         super(Mailbox, self).delete(*args, **kwargs)
 
+    def get_mailaddresses(self):
+        """
+        Get a list of mail addresses assigned to this mailbox.
+
+        """
+        addrs = [
+            mbadr.mailaddress for mbadr in
+            self.mailaddressmailbox_set.all()
+        ]
+        return addrs
+    mailaddresses = property(get_mailaddresses)
+
     def __str__(self):
         return self.username
 
@@ -125,8 +137,9 @@ class MailAddressMailbox(TimeStampedModel, models.Model):
     This is the model class to assign a mail address to a mailbox.
 
     """
-    mailaddress = models.OneToOneField(MailAddress, primary_key=True)
-    mailbox = models.ForeignKey(Mailbox)
+    mailaddress = models.OneToOneField(
+        MailAddress, verbose_name=_('mailaddress'), primary_key=True)
+    mailbox = models.ForeignKey(Mailbox, verbose_name=_('mailbox'))
 
     class Meta:
         unique_together = ('mailaddress', 'mailbox')