Issue #2016691 by damiankloip, LinL: Convert Drupal\serialization\Tests\SerializationTest to DrupalUnitTestBase.

Issue #2009670 by esunger, jeroen12345, hussainweb: Replace theme() with drupal_render() in simpletest module.

Issue #1978938 by sidharthap, disasm, laurentchardin, pguillard, dawehner, somepal: Convert overlay_user_dismiss_message() to a Controller.

Issue #2035087 by lazysoundsystem, Crell, Cottser: Remove remaining t() from test assert messages in views and views_ui

Issue #1978952 by vijaycs85, vyasamit2007, tim.plunkett: Convert shortcut_set_add() to a Controller.

Issue #2030457 by Mark Carver, Cottser: Fixed Warning: Missing argument 3 for template_preprocess() for theme functions overridden by templates.

Issue #849624 by brad.bulger, Stevel, oriol_e9g, Alan Evans: Fixed wrong permission for admin/structure/menu/parents.

Issue #1987262 by the_phi, clemens.tolboom, Damien Tournoud, bshaffer, catch, alexpott, bvanmeurs: Fixed [Installation Error] Symfony: 'The service definition 'request' does not exist.'

Issue #1868004 by fago, das-peter, Berdir, EclipseGc, fubhy the cat, dixon_: Improve the TypedData API usage of EntityNG.

Issue #1971158 by Berdir, beejeebus, alexpott, amateescu: Add loadMultiple() and listAll() caching to (cached) config storage.

Issue #1946462 by jibran, kim.pepper: Convert all confirm_form() in content_translation.admin.inc and content_translation.pages.inc to the new form interface.

Issue #2031305 by jenlampton, thedavidmeister: Remove theme_more_help_link() and replace with a #type link render array.

Issue #352951 by Wim Leers, mfer, mcjim, larowlan, RobLoach, sdboyer, Owen Barton, JohnAlbin: Make JS & CSS Preprocessing Pluggable.

Issue #1833022 by e0ipso, plach, YesCT, kfritsche, penyaskito, vijaycs85, nod_, cam8001: Only display interface language detection options to customize more granularity.