Added flat design for installer.
Fixed bug#10706 - dashboard settings are lost by different user login.
Follow-up fix for Excel export: enforce data formatting as text.
Added config switch to disable the template cache for development environments.
Fixed an issue which would cause the navigation container to stay at expanded height after closing a submenu by clicking the main item.
Added exceptions.
Merge remote-tracking branch 'upstream/master' into otrs-master