drop usage of ugettext_lazy (deprecated in django 3.0, removed in 4.0) in favour of gettext_lazy

Signed-off-by: Mattia Rizzolo <mattia@debian.org>

backend/const.py

 from collections import namedtuple
-from django.utils.translation import ugettext_lazy as _
+from django.utils.translation import gettext_lazy as _
 
 Status = namedtuple("Status", ("code", "tag", "sdesc", "pronoun", "ldesc"))
 Progress = namedtuple("Progress", ("code", "tag", "sdesc", "ldesc"))

backend/models.py

@@ -2,7 +2,7 @@
 Core models of the New Member site
 """
 from __future__ import annotations
-from django.utils.translation import ugettext_lazy as _
+from django.utils.translation import gettext_lazy as _
 from django.core.exceptions import ObjectDoesNotExist
 from django.utils.timezone import now
 from django.db import models

dsa/models.py

 """
 Code used to access Debian's LDAP
 """
-from django.utils.translation import ugettext_lazy as _
+from django.utils.translation import gettext_lazy as _
 from django.db import models
 from django.urls import reverse
 from django.forms.models import model_to_dict

legacy/models.py

-from django.utils.translation import ugettext_lazy as _
+from django.utils.translation import gettext_lazy as _
 from django.utils.timezone import utc, now
 from django.db import models
 from django.urls import reverse

nm2/settings.py

@@ -8,7 +8,7 @@ For the full list of settings and their values, see
 https://docs.djangoproject.com/en/2.2/ref/settings/
 """
 
-from django.utils.translation import ugettext_lazy as _
+from django.utils.translation import gettext_lazy as _
 from nm2.lib.log_utils import get_logging_config
 from signon import providers
 import os.path

process/models.py

 from __future__ import annotations
 from typing import Tuple
-from django.utils.translation import ugettext_lazy as _
+from django.utils.translation import gettext_lazy as _
 from django.utils.timezone import now
 from django.conf import settings
 from django.urls import reverse

signon/models.py

 from __future__ import annotations
 import json
 import datetime
-from django.utils.translation import ugettext_lazy as _
+from django.utils.translation import gettext_lazy as _
 from django.db import models
 from django.forms.models import model_to_dict
 from django.contrib.auth import get_user_model

wizard/views.py

-from django.utils.translation import ugettext_lazy as _
+from django.utils.translation import gettext_lazy as _
 from django import forms
 from django.views.generic import TemplateView, FormView
 from backend.mixins import VisitorMixin