Fix Django4 deprecation warnings

gnuviechadmin/help/admin.py

@@ -1,7 +1,7 @@
 from django.contrib import admin
 from django.contrib.auth import get_user_model
 from django.contrib.auth.admin import UserAdmin as BaseUserAdmin
-from django.utils.translation import ugettext_lazy as _
+from django.utils.translation import gettext_lazy as _
 
 from help.models import HelpUser
 

gnuviechadmin/help/models.py

@@ -2,7 +2,7 @@ import uuid
 
 from django.conf import settings
 from django.db import models
-from django.utils.translation import ugettext_lazy as _
+from django.utils.translation import gettext_lazy as _
 
 
 class HelpUser(models.Model):

gnuviechadmin/invoices/apps.py

@@ -1,5 +1,5 @@
 from django.apps import AppConfig
-from django.utils.translation import ugettext_lazy as _
+from django.utils.translation import gettext_lazy as _
 
 
 class InvoiceConfig(AppConfig):

gnuviechadmin/invoices/models.py

@@ -3,7 +3,7 @@ from django.conf import settings
 from django.core.exceptions import ValidationError
 from django.core.validators import FileExtensionValidator
 from django.db import models
-from django.utils.translation import ugettext_lazy as _
+from django.utils.translation import gettext_lazy as _
 
 CURRENCIES = [(1, "EUR")]