Use gettext_lazy instead of ugettext_lazy (#421)

Co-authored-by: Camilo Nova <camilo.nova@gmail.com>

constance/admin.py

@@ -19,7 +19,7 @@ from django.utils.encoding import smart_bytes
 from django.utils.formats import localize
 from django.utils.module_loading import import_string
 from django.utils.text import normalize_newlines
-from django.utils.translation import ugettext_lazy as _
+from django.utils.translation import gettext_lazy as _
 from django.urls import path
 
 from . import LazyConfig, settings

constance/backends/database/models.py

@@ -1,7 +1,7 @@
 from django.db import models
 from django.core.exceptions import ImproperlyConfigured
 
-from django.utils.translation import ugettext_lazy as _
+from django.utils.translation import gettext_lazy as _
 
 try:
     from picklefield import PickledObjectField

constance/checks.py

@@ -1,5 +1,5 @@
 from django.core import checks
-from django.utils.translation import ugettext_lazy as _
+from django.utils.translation import gettext_lazy as _
 
 
 @checks.register("constance")

constance/management/commands/constance.py

@@ -2,7 +2,7 @@ from django.apps import apps
 from django.conf import settings
 from django.core.exceptions import ValidationError
 from django.core.management import BaseCommand, CommandError
-from django.utils.translation import ugettext as _
+from django.utils.translation import gettext as _
 from django import VERSION