Gear up for development.
Update WetKit Core for Issue #2394391: Performance improvements (Panels Plugins and i18n)
Update WetKit Language for Issue #2394391: Performance improvements (Panels Plugins and i18n)
Update WetKit WET-BOEW for Update WxT to latest v4.0.9 version.
Merge pull request #1603 from sylus/7.x-4.x

Updates for 4.x branch.