Fixed tests that I broke a few commits ago.

from django.core.management import call_command, CommandError

from django.test import TestCase

from django.test.utils import override_settings

from django.utils import translation

from django.utils import translation, six

from django.utils.six import StringIO

test_dir = os.path.abspath(os.path.dirname(__file__))

class MessageCompilationTests(TestCase):

    def setUp(self):