Displays the date, time, and username of the most recent save and publish

cms/djangoapps/contentstore/views/item.py

cms/static/js/models/xblock_info.js

cms/static/js/spec/views/pages/container_subviews_spec.js

cms/static/js/views/pages/container.js

cms/static/js/views/pages/container_subviews.js

cms/static/sass/views/_container.scss

cms/templates/container.html

cms/templates/js/mock/mock-container-page.underscore

cms/templates/js/publish-history.underscore

cms/templates/js/publish-xblock.underscore