Reset current language after discussion tests, so that other languages don't…

Reset current language after discussion tests, so that other languages don't leak into tests that don't use the LocaleMiddleware

lms/djangoapps/django_comment_client/forum/tests.py

@@ -6,6 +6,7 @@ from django.core.urlresolvers import reverse
 from django.http import Http404
 from django.test.client import Client, RequestFactory
 from django.test.utils import override_settings
+from django.utils import translation
 from lms.lib.comment_client.utils import CommentClientPaginatedResult
 from edxmako.tests import mako_middleware_process_request
 
@@ -1245,6 +1246,8 @@ class CommentsServiceRequestHeadersTestCase(UrlResetMixin, ModuleStoreTestCase):
             self.client.login(username=username, password=password)
         )
 
+        self.addCleanup(translation.deactivate)
+
     def assert_all_calls_have_header(self, mock_request, key, value):
         expected = call(
             ANY,  # method