openolat#127: do load all calendars as only the public entries will be visible to non members anyway

Merge branch 'OpenOLAT_14.0' of ssh://srosse@office.frentix.com/home/srosse/repositories/OpenOLAT.git into OpenOLAT_14.0

Revert "openolat#124: filter deleted files in the getNewest function used by the folder peek preview controller"

This reverts commit 4b2df944.

openolat#124: filter deleted files in the getNewest function used by the folder peek preview controller

openolat#123: make the invalidateOlatCourse call async as we do not use the response and the invalidation can take some time

openolat#99: do explicitly set the picture and video elements to visible as the delete button can't be seen by default

openolat#34: do not show any dropdown in the create course controller when the sismanager is disabled