Issue #2398463 by amolnw2778, DickJohnson, thamas, emma.maria, LewisNyman, tadityar, lauriii, Manjit.Singh, trboslav, haasontwerp, richgilbert, pguillard, rachel_norfolk, Maninders, rteijeiro: Clean up the "content" component in Bartik

Issue #2470617 by trboslav, MathieuSpil, Manjit.Singh, _nolocation, LewisNyman, YesCT: Clean up css in ckeditor module