Issue #1754246 by webflo, swentel, penyaskito, andypost, alexpott, YesCT, dagmar: Languages should be configuration entities.

Issue #111715 by andypost, swentel, tim.plunkett, sun, Berdir, amateescu, kkaefer, YesCT, dagmar, chx: Convert node/content types into configuration.

Issue #1969728 by yched, effulgentsia, swentel, fago, plach: Implement Field API 'field types' as TypedData Plugins.

Issue #1981342 by aspilicious, andypost, swentel: Drop procedural usage of fields in [s-u-v] modules.

Issue #1818570 by Berdir, effulgentsia, das-peter, andypost: Convert users to the new Entity Field API.

Issue #1498674 by plach, das-peter, Schnitzel, dawehner, YesCT, attiks, Berdir, Gábor Hojtsy, Soul88, Carsten Müller: Refactor node properties to multilingual.

Issue #1620010 by dawehner, ParisLiakos, plach, jibran: Move LANGUAGE constants to the Language class.

Issue #1957888 by ParisLiakos, Berdir: Fixed Exception when a field is empty on programmatic creation.

Issue #1893108 follow-up by Berdir, dawehner: Rename EntityUnitBaseTest => EntityUnitTestBase to conform to coding standards.

Issue #1845546 by fago, EclipseGc, attiks, effulgentsia: Implement validation for the TypedData API.

Issue #1801304 by Amitaibu, amateescu, effulgentsia, tim.plunkett, EclipseGc, Fabianx, Cottser: Added Entity reference field.

Issue #1833334 by das-peter, plach, Berdir, fago: EntityNG: integrate a dynamic property data table handling.

Issue #1869250 by fago, Berdir, das-peter, YesCT, mradcliffe, fubhy: Various EntityNG and TypedData API improvements.

Issue #1825568 by alexpott, fago, Berdir: Fixed Random test failure in Drupal\system\Tests\Entity\EntityFormTest.

Issue #1696640 by fago, effulgentsia, tim.plunkett, dixon_, plach: Add a uniform Entity Property API.