Merge pull request #5942 from edx/cohorted-courseware

CHANGELOG.rst

cms/djangoapps/contentstore/views/course.py

...pps/contentstore/views/tests/test_group_configurations.py

cms/djangoapps/contentstore/views/tests/test_item.py

cms/djangoapps/models/settings/course_metadata.py

cms/envs/common.py

cms/static/js/models/group.js

cms/static/js/models/group_configuration.js

cms/static/js/spec/models/group_configuration_spec.js

cms/templates/group_configurations.html

cms/templates/settings.html

cms/templates/settings_advanced.html

cms/templates/settings_graders.html

cms/templates/widgets/header.html

cms/urls.py

common/djangoapps/lang_pref/middleware.py

common/djangoapps/lang_pref/tests/test_middleware.py

common/djangoapps/lang_pref/tests/test_views.py

common/djangoapps/lang_pref/views.py

common/djangoapps/student/tests/test_create_account.py