Issue #1799218 by ACF, Albert Volkman, anenkov, penyaskito, znerol, LinL: Convert taxonomy_override_selector() and taxonomy_terms_per_page_admin() variables to use configuration system.

Issue #1849792 by damiankloip: Abstract usage of 'config_prefix' on ConfigStorageController into getConfigPrefix method.

Issue #1857324 by Berdir, tim.plunkett: Use default theme name and entity key in $build for user entity.

Issue #1815930 by gbrands, amontero: Fixed Update watchdog message in file_unmanaged_copy() with correct string/variable replacement values.

Issue #1783196 by dawehner, tim.plunkett, damiankloip: Get the views plugin manager from the DIC when possible.

Issue #1849814 by damiankloip, dawehner: Unit-Test for PluginBase::unpackOptions and PluginBase::setOptionDefaults.

Issue #1862966 by dead_arm, jibran: marker and form-required red (#FF0000) on a white background does not pass the WCAG AA contrast threshold.

Issue #1849480 by tim.plunkett, sdboyer: Fixed Allow ConfigEntity classes to control how they are saved.

Issue #817118 by Sylvain Lecoy, bfroehle, Stevel: remove {authmap} and migrate OpenID entries to their own table.

Issue #1862024 by katbailey: Remove all references to hook_url_inbound_alter() as it is no longer invoked.

Issue #552604 by sun, lambic, swentel, yched, Lukas von Blarer: Adding new fields leads to a confusing 'Field settings' form.

Issue #1834594 by effulgentsia, Rob Loach: Update dependencies (Symfony and Twig) follow up fixes for Composer.

Issue #1167350 follow-up by ry5n, dead_arm: Slightly modify colour on action links to make it WCAG AA accessible.

Issue #1804688 by Sutharsan, YesCT, clemens.tolboom, Gábor Hojtsy, webflo, Jose Reyero: Download and import interface translations.

Issue #1833440 by scor, klausi, Crell: Added Implement partial matcher based on content negotiation MIME type.