LPS-37928 Use the right portletId when hiding the default error message.

The portletId in the portletConfig object obtained through getPortletConfig() is the rootPortletId, but portlet_messages.jspf uses the portletId. Thus, for instantiable portlets the portletId should be obtained through portalUtil.getPortletId(request). This works in configuration views, because there the portletId of the configurationPortlet (86, non-instantiable) is used.
LPS-37928 Apply every where
LPS-40482 Don't copy `.sass-cache` from parent theme. Let `build-css` take care ot if.
LPS-39625 - Fix OpenSocial Portlet after the migration to Alloy 2.0
LPS-39625 - Fix OpenSocial Portlet after the migration to Alloy 2.0
LPS-39625 - Source formatting
LPS-39625 - SF per Iliyan's comments
LPS-39625 SF
LPS-39625 Lang keys