chore: Use django.utils.translations.gettext_lazy instead of deprecated ugettext_lazy

Part-of: <https://dev.funkwhale.audio/funkwhale/funkwhale/-/merge_requests/2709>

api/funkwhale_api/common/authentication.py

@@ -1,6 +1,6 @@
 from allauth.account.utils import send_email_confirmation
 from django.core.cache import cache
-from django.utils.translation import ugettext as _
+from django.utils.translation import gettext as _
 from oauth2_provider.contrib.rest_framework.authentication import (
     OAuth2Authentication as BaseOAuth2Authentication,
 )

api/funkwhale_api/common/serializers.py

@@ -5,7 +5,7 @@ import os
 import PIL
 from django.core.exceptions import ObjectDoesNotExist
 from django.core.files.uploadedfile import SimpleUploadedFile
-from django.utils.encoding import smart_str
+from django.utils.encoding import smart_text
 from django.utils.translation import gettext_lazy as _
 from drf_spectacular.types import OpenApiTypes
 from drf_spectacular.utils import extend_schema_field

api/funkwhale_api/common/validators.py

@@ -6,7 +6,7 @@ from django.core.exceptions import ValidationError
 from django.core.files.images import get_image_dimensions
 from django.template.defaultfilters import filesizeformat
 from django.utils.deconstruct import deconstructible
-from django.utils.translation import ugettext_lazy as _
+from django.utils.translation import gettext_lazy as _
 
 
 @deconstructible

api/funkwhale_api/users/admin.py

@@ -1,7 +1,7 @@
 from django import forms
 from django.contrib.auth.admin import UserAdmin as AuthUserAdmin
 from django.contrib.auth.forms import UserChangeForm, UserCreationForm
-from django.utils.translation import ugettext_lazy as _
+from django.utils.translation import gettext_lazy as _
 
 from funkwhale_api.common import admin
 

api/funkwhale_api/users/models.py

@@ -12,7 +12,7 @@ from django.db.models import JSONField
 from django.dispatch import receiver
 from django.urls import reverse
 from django.utils import timezone
-from django.utils.translation import ugettext_lazy as _
+from django.utils.translation import gettext_lazy as _
 from django_auth_ldap.backend import populate_user as ldap_populate_user
 from oauth2_provider import models as oauth2_models
 from oauth2_provider import validators as oauth2_validators