Added a redirect to the last screen in overviews.
Replaced base64 with URI::Escape mechanism.
Tidied the code.
Merge branch 'rel-3_3' of git.otrs.com:otrs/otrs into bug-9851-marb-rel-3_3
Fixed #9851, Unlocking a ticket in the small view results in AgentTicketZoom.
Merge branch 'bug-9851-marb-rel-3_3' into rel-3_3

Conflicts:
	CHANGES.md
Merge remote-tracking branch 'upstream/rel-3_3' into rel-3_3