LPS-40576 Fix StructureXsdException
Revert "LPS-40761 SF"

This reverts commit 7f889ed018c66bc3a719901db3e09427a82d0eac.
Revert "LPS-40761 Updating references to old calendar portlet in layouts and pages"

This reverts commit 384fca91a700e1d0317f01158429b41ebfd81e1e.
LPS-40873 - Allow Chat Conversation to be extended
SOS-1820 update groups' theme and remove so-welcome-theme through upgrade
SOS-1820 SF
LRDCOM-6291 Update SO Screenshots
SOS-1820 remove UpgradeGroup. Should be split into upgradeLayoutSet and upgradeLayout
SOS-1820 Add UpgradeLayout, UpgradeLayoutSet, UpgradeTheme
SOS-1820 Sort
SOS-1820 SF
LPS-41113 Fix compile
LPS-41114
Update SO releng.properties
pootle exported keys [by Liferay translation manager v.2.6.1]
ant build-lang
SOS-1773 Modifying SO Strata Theme to play well with New Dockbar
SOS-1808 Modifications to the User Bar to be more compatible with the New Dockbar
SOS-1808 Re-implementing Sites portlet as the Go-to menu
SOS-1808 Updating Sites markup to use placeholder attribute