Squashed 'framework/redux-framework/' changes from 3c6f400..c065dad

c065dad Fix for issue #1670. ThemeCheck and customizer callback
358e596 Lang update

git-subtree-dir: framework/redux-framework
git-subtree-split: c065dad9b96f7f8778af043e8355545088f1f2f2
Redux Framework v3.3.7.9
Merge commit 'b20055cb8a00d3a6d3f3d508c8842a5e891d69b6'