Issue #2324083 by er.pushpinderrana, martin_q: Fix up description of return value from NestedArray::getValue()
Issue #1987882 by disasm, vijaycs85, penyaskito, kim.pepper, likin, YesCT, InternetDevels, dawehner, wamilton, Letharion, katbailey, googletorp, tim.plunkett, acrollet, neetu morwani: Convert content_translation routes to a new style controller.
Issue #2319719 by Tim Bozeman, pcambra, undertext, bojanz: Fixed Widget validation crashes on ItemList violations.
Issue #2250243 by dawehner, sun: Remove needless ContainerAware dependency from AuthenticationManager.
Issue #2324113 by penyaskito: Move Drupal/Core/Utility/Color to Drupal/Component/Utility/Color.
Issue #2309501 by garphy | dawehner: Use plugin IDs instead of titles for toolbar classes.
Issue #2271251 by ParisLiakos, undertext, JeroenT, StevenPatz, tim.plunkett: Remove usages of watchdog() from non-form and non-controllers.
Issue #2290267 by jhodgdon: Image-related plugin classes need more docs links.
Issue #2324293 by larowlan: Fixed PHPUnit code coverage broken.
Issue #2323521 by herom: Fixed a couple of t() calls in core.
Issue #2318847 by tstoeckler: Fixed ExtensionDiscovery does not allow the value of the "type" key to be wrapped in quotes.