OO-675 fix resetting of standard element of extjs framework
non-jira: set release number to 8.4.3
Added tag OpenOLAT 8.4.3 for changeset 6ecbc753261e
OO-623,OPENOLAT-128: prevent batch merge, configure, remove... in the groups lists if an item is managed, show a warning if it's the case, add some warnings too if there isn't no selected group for a batch operation
Merge OpenOLAT 8.4.3 to OpenOLAT default branch with 682fb140af01fcca79fd1c1778457296505755cd