BLD-1117: Add read-only list of Group Configurations.
Missing "_()" in course_module.py
Make the strings in "Advanced Settings" page localizable

The fields should be translated before render into html templates.
Merge pull request #4286 from louyihua/studio-advanced-settings-localization

Make the strings in "Advanced Settings" page localizable
Add FEATURE['ENABLE_GROUP_CONFIGURATIONS'] and os.environ['FEATURE_GROUP_CONFIGURATIONS'].
Merge pull request #4267 from edx/tim/feature-group-configurations

BLD-1217: Create feature flag for switching Group Configurations editing on and off
Merge pull request #4287 from louyihua/localization-cms

Missing "_()" in course_module.py
Fixes has_changes to search all the way to leaf nodes
skipping update assets, not just collectstatic, in unit tests
Add openedx-analytics discussion group to CONTRIBUTING file
Update AUTHORS
Merge pull request #4299 from edx/clytwynec/skip_update_assets_for_unittests

skipping update assets, not just collectstatic, in unit tests
Merge pull request #4302 from edx/benmcmorran/fix-has-changes

Fixes has_changes to search all the way to leaf nodes
Merge pull request #4306 from edx/db/openedx-analytics

Add openedx-analytics discussion group to CONTRIBUTING file
Hide GroupConfiguration behind feature flag in cms/templates/settings.html.
Deleting a child of a unit should convert the unit to draft
if the unit is draftable but isn't yet draft.
Update translations (autogenerated message)
Clean up i18n paver commands
Merge pull request #4316 from edx/anton/group-experiments

BLD-1117, BLD-1217: Add read-only list of Group Configurations, Create feature flag.
Merge pull request #4314 from edx/sarina/070714-language-update

Sarina/070714 language update