OO-1181: fix some issues with the ordering of the user property across different groups and prevent properties to disappear

OO-1180: hardened some methods from kalendarEvent against null end date, build a better test suite for calendar which check the real begin and end and clear the cache to check the persisted .ics files

OO-1182: pass the toolbar as constructor to initialize all sub controller with it, independent of the timing of this initialization

OO-1179: set the defined end date (and not the current date) as end date of the event, add a unit test which check the data of the calendar

OO-1068: fix a red screen if the extended search of question poll catch an event from the  controller with the table

OO-1174: add the list of roles wanted to retrieve the members of the group to delete, add a translator fallback for the mail template

OO-983: remove the scaling factor as the javascript library works with the real picture size and not the screen size

OO-981: if the catalog is disabled, remove the tool "add to catalog" in course toolbar and remove the little message in publish workflow

no-jira: fix a red screen if an imported course has groups with areas reference but the area don't exists any more