Issue #2273671 by JeroenT, mgifford, Tim Bozeman, StryKaizer, catch: Allowed number of values more than 1 needs aria-describedby Support

Issue #2473945 by Cottser, rachel_norfolk, axe312, davidhernandez, yannickoo, emma.maria, cilefen, akalata, jaxxed, LewisNyman: Prefix form-item classes with js-

Issue #2201693 by plopesc, e0ipso, swentel: Field output supporting code should move out of field.module.

Issue #1987398 by Nigel_S, Tim Bozeman, InternetDevels, adsw12, joelpittet, Cottser, mdrummond, dsayswhat, jerdavis, rteijeiro, LewisNyman, Rumato, gnuget: Field.module - Convert theme_ functions to Twig.