Issue #1712250 by alexpott, n3or, cam8001, vijaycs85, Albert Volkman, jibran, heyrocker, chx: Convert theme settings to configuration system.

Issue #1977784 by YesCT, Gábor Hojtsy, EllaTheHarpy: Content language settings configuration page needs to determine what entities and bundles to include.

Issue #1898434 by gnuget, joelpittet, webthingee, -enzo-, Cottser: Remove theme_options_none(), use an alter hook instead for changing empty option label.

Issue #1982024 by Cottser, Fabianx: Lazy-load Attribute objects later in the rendering process only if needed.

Issue #1828616 follow-up by tstoeckler, Berdir: Allow AnnotatedClassDiscovery to find plugins in Drupal\Component as well.

Issue #1606362 by nod_, Angry Dan, seutje: Use throw when an ajax error occurs and extend JavaScript's Error object.

Issue #1981198 by yched: Change notice: More accurate names and form_ids() for Field UI form classes.

Issue #1981312 by tim.plunkett, dawehner: Move views_ui() code out of the View entity type annotation.

Issue #1944472 by larowlan, quicksketch, effulgentsia: Add generic content handler for returning dialogs.

Issue #1981760 by Wim Leers, nod_: Edit should use the new drupalContextualLinkAdded event to cleanly instead of hackily insert its 'Quick edit' contextual link.

Issue #1969970 by dawehner, jhodgdon, webchick, EclipseGc, tim.plunkett: Documentation for translatable plugin properties on annotations

Issue #1944636 by alexpott, YesCT: Fixed PECL Intl extension usage in DateTimePlus class broken and untested.

Issue #1971108 by Wim Leers, jessebeach, nod_: Convert contextual.js to use Backbone (and support dynamic contextual links).

Revert "Issue #1971108 by Wim Leers, jessebeach, nod_: Convert contextual.js to use Backbone (and support dynamic contextual links)."

This reverts commit aad2d4a6 since the canges to edit.module were unintended.

Issue #1975486 by Berdir: Add a persistent cache in DatabaseStorageController::getFieldDefinitions().

Issue #1974040 by Gábor Hojtsy: Fixed When installing in an RTL language, it should be RTL from profile selection onwards.

Issue #1842718 by alippai, andypost, alexpott, nod_: Use new Transliteration functionality in core for machine names.

Issue #1973448 by vijaycs85: Provide config schema to field types, widgets and storage in options module.