[1.8.x] Added missing import for previous commit.

from django.conf import settings

from django.template import Context, Template

from django.template.base import TemplateSyntaxError

from django.test import RequestFactory, TestCase, override_settings

from django.test import (

    RequestFactory, SimpleTestCase, TestCase, override_settings,

)

from django.utils import six, translation

from django.utils._os import upath

from django.utils.formats import (