BK-884 Remove from Aloha Bookstype plugin heading change style functionality
BK-885 Support for tooltips on tab icons
BK-886 Reload data functionality from the editing environment
BK-888 Messages used in JavaScript files should support i18n
BK-890 Aloha plugin for Headings should have support for i18n
BK-851 Delete static files belonging to older editor
BK-891 Check cover image validity using the importer delegate