Replaced ugettext and ugettext_lazy with gettext and gettext_lazy

ugettext and ugettext_lazy were deprecated in Django 3 and will be
removed in Django 4.

dav_auth/forms.py

@@ -2,7 +2,7 @@
 import logging
 from django import forms
 from django.contrib.auth import forms as auth_forms, password_validation
-from django.utils.translation import ugettext, ugettext_lazy as _
+from django.utils.translation import gettext, gettext_lazy as _
 
 logger = logging.getLogger(__name__)
 
@@ -48,7 +48,7 @@ class SetPasswordForm(forms.Form):
         if password1 and password2:
             if password1 != password2:
                 raise forms.ValidationError(
-                    ugettext('Passwörter stimmen nicht überein'),
+                    gettext('Passwörter stimmen nicht überein'),
                     code='password_mismatch',
                 )
         return password2