OO-2803: separate the video from the table, remove the list in editor which duplicate the data model, rewrite the validation of chapter, drive the video per javascript command and not per reload of the video...

OO-2837: add the possibility to lazy load tabs in the tabbed pane and use it for business group administration and user overview

OO-2836: update to selenium 3.4, migrate the tests to pass with chrome, add css class mostly in wizards, remove some fieldset in fieldset, add some label around checkbox

OO-2636: only show the useful segments of the lectures administration in a course, if disable only show the configuration, if enable all segments; and update the toolbar aafter configuration changes

OO-2636: lecture module disabled per default, fix behavior of the lectures blocks list in user tool for the coaches

OO-2636: enhance search in coaching tool with different views if a single user is found or multiple, implement excel export with 2 sheets