Ability to uncheck "Multiple values" for existing custom fields (#12251).
Plugins cannot route wiki page sub-path (#12749).
Merged r11163 from trunk to 2.2-stable (#12809)
Swedish translation updated by Nicklas Holm.
Swedish translation changed by Nicklas Holm (#12810, #12809)
Swedish translation updated by Nicklas Holm (#12809)
Merged r11160 from trunk to 2.2-stable (#12800)
Serbian translation updated by Miodrag Milic.
Serbian translation changed by Miodrag Milic (#12806, #12800)
Serbian translation updated by Miodrag Milic (#12800)
Fixed: Cannot edit a wiki section which title starts with a tab (#12799).
Code cleanup (#12801).
