Issue #2321809 by undertext, JeroenT | dawehner: Put the access manager onto \Drupal.
Issue #2338479 by rpayanm | dawehner: Convert \Drupal\views\Plugin\Derivative\ViewsMenuLink to use DeriverBase.
Issue #2339435 by YesCT, alexpott: Default no longer needs to be a property on Language or ConfigurableLanguage.