User Registration now uses all possibilities of the Membership Model. So you could apply for a membership with one step.

Fixed an error in the cleanup-registration command.
Also more stuff has been translated

src/membership/models.py

@@ -71,9 +71,11 @@ class ActivationManager(models.Manager):
         return self.create(user=user, activation_key=activation_key)
 
     def expired(self):
+        timespan = timedelta(days=settings.ACCOUNT_ACTIVATION_DAYS)
+        expiration_date = timezone.now() - timespan
         return self.filter(
             user__is_active=False,
-            user__date_joined__lt=self.expiration_date
+            user__date_joined__lt=expiration_date
         )
 
 
@@ -144,7 +146,9 @@ class Membership(AbstractUser):
     gender = models.CharField(
         _("Gender"),
         max_length=1,
-        choices=GENDER_CHOICES
+        choices=GENDER_CHOICES,
+        blank=True,
+        null=True
     )
     # first_name = models.CharField(_("Given Name"), max_length=30)
     # last_name = models.CharField(_("Last Name"), max_length=30)