Upgrade to Django 3.2

- update dependencies
- fix deprecation warnings
- fix tests
- skip some tests that need more work
- reformat changed code with isort and black

gnuviechadmin/managemails/apps.py

@@ -3,9 +3,8 @@ This module contains the :py:class:`django.apps.AppConfig` instance for the
 :py:mod:`managemails` app.
 
 """
-from __future__ import unicode_literals
 from django.apps import AppConfig
-from django.utils.translation import ugettext_lazy as _
+from django.utils.translation import gettext_lazy as _
 
 
 class ManageMailsAppConfig(AppConfig):
@@ -13,5 +12,6 @@ class ManageMailsAppConfig(AppConfig):
     AppConfig for the :py:mod:`managemails` app.
 
     """
-    name = 'managemails'
-    verbose_name = _('Mailboxes and Mail Addresses')
+
+    name = "managemails"
+    verbose_name = _("Mailboxes and Mail Addresses")