Implemented first version of a slidable navigation bar.
Merge branch 'master' into feature-slidingnavigation-mab-master

Conflicts:
	Kernel/Output/HTML/Standard/AgentNavigationBar.dtl
	var/httpd/htdocs/skins/Agent/default/css/Core.Header.css
Replaced characters by font awesome icons.
Tidied.
Fixed: My tickets & Company tickets in 3.3.4 (bug#10212).
Updated Polsih translation
Fixed bug#4512 - HTMLUtils ToAscii forces line breake on fixed line-length 78.
Follow-up fix for bug#10211
Merge branch 'master' into feature-slidingnavigation-mab-master

Conflicts:
	Kernel/Output/HTML/Standard/AgentNavigationBar.dtl
Fixed: Navigation broken if many modules installed (bug#6802).
Merge branch 'feature-slidingnavigation-mab-master'
Added label spacer to process management canvas, which sets positions of transition labels dynamically to avoid overlapping labels.
Updated CHANGES.
Fixed translation issues.
Fixed: Queue and Service delimiter '::' should be replaced in the output by ': :' to allow browsers a line break (bug#7531).
Updated CHANGES.
Layout::Get() is now deprecated. Replaced all calls with Translate().
Fixed: Ticket overviews don't show column headers for priority and unread articles in small mode (bug#7440).
Code cleanup. Make less verbose by default.
Fixed bug#9616 - Too long activities and transitions are not displayed correctly.
Merge branch 'master' of git.otrs.com:otrs/otrs
Updated CHANGES file.