Issue #2321609 by benjy, dawehner: Fixed Provide a helpful message in case requirements are not met.
Issue #1976298 by larowlan: Move taxonomy_get_tree() and associated functions to Taxonomy storage, deprecate procedural wrappers.
Issue #2337227 by er.pushpinderrana, larowlan: Fixed NodeAccessControlHandler performs non-strict in_array check.
Issue #2303525 by paulmckibben, tim.plunkett: Provide link tags to alternate languages (hreflang) in HTML head.
Issue #2320521 by jhodgdon: Fixed Follow-up: Node language views filters need label adjustments.
Issue #2328411 followup by herom: Convert all permissions to yml files and permission callbacks.
Issue #2334785 by znerol: Remove _maintenance request attribute from SpecialAttributesRouteSubscriber.
Issue #2329703 by maximpodorov: Fix spelling in varous files
Issue #2329703 by maximpodorov: Fix spelling in varous files
Issue #2329703 by maximpodorov: Fix spelling in varous files
Issue #2329703 by maximpodorov: Fix spelling in varous files
Issue #2329703 by maximpodorov: Fix spelling in varous files
Issue #2325571 by asif_khan, omers | dawehner: Replace _theme() calls by calls to \Drupal::theme()->render().
Issue #2329847 by tuutti, rachel_norfolk, Cottser | davidhernandez: Use Attribute to replace hard coded classes in language-negotiation-configure-form.html.twig.
Issue #2337927 by effulgentsia, plach, fago: Fixed SqlContentEntityStorage::onFieldStorageDefinition(Create|Update|Delete)() is broken for base fields.
Issue #2232605 by alexpott, dawehner, martin107, Cottser, sun: Fixed Themes cannot be uninstalled.
Issue #2338571 by znerol: Remove SessionManager::startLazy().
Issue #2325571 followup by omers: Replace _theme() calls by calls to \Drupal::theme()->render().
Issue #2309889 by tim.plunkett, dawehner: Fixed DrupalKernel requires a Drupal\Core\*\Plugin directory for annotated classes to be discovered.
Issue #2063303 by dawehner, damiankloip, Wim Leers: Fixed A Drupal 8 AjaxResponse that must return a 403, returns a 403 and prints 'A fatal error occurred: '