Sort versions drop down on the bulk edit form.
Merged r4516 from trunk (i18n 0.4.2 gem is now required: 'gem install -v=0.4.2 i18n', see #7013).
Backported r4530 from trunk.
Fixed: issue description Quote button lost by r3941 (#7122).
Fixed: r4492 breaks the ability to select issue custom fields available for projects issues (#7121).
Adds a css class for gantt subjects.
Gantt code cleaning.
Gantt code cleanup.
Gantt: make the png looks more like html.
Gantt: make the pdf looks more like html.
