Issue #2076033 by juampy: Fixed PHP warning when looking if a REST resource defines authentication providers.

Issue #2087231 by tim.plunkett, pwolanin: Add a PluginBase in the Core namespace with t() as a helper method.

Issue #2089635 by tim.plunkett, disasm, larowlan: Convert non-test non-form page callbacks to routes and controllers.

Issue #1927174 by jessebeach, Wim Leers, nod_, Gábor Hojtsy: Complete the work to make the Toolbar administration menu sub tree rendering more efficient.

Issue #2085907 by YesCT, Gábor Hojtsy: Ensure all configuration entities have an Edit/Configure tab by default.

Issue #2083615 by Gábor Hojtsy, YesCT: Use links annotation for config entity URI like for content entities.

Issue #2087995 by amateescu: All entity post*() and pre*() methods should call their parent implementation.

Issue #1834002 by Gábor Hojtsy: Fixed Delete operations are all over the place. Remove tabs, provide title in routing.

Issue #2032453 by Berdir: Fixed Random fail: WebTestBase::randomString returning a string containing a $ followed by a number causes assertLink() to fail.

Issue #2089361 by thedavidmeister: Fixed TranslationInterface references \Drupal\Core\Utility\String::format() in its docs.

Issue #2089627 by tim.plunkett: Move \Drupal\system\SystemConfigFormBase to \Drupal\Core\Form\ConfigFormBase.

Issue #2089851 by Wim Leers: Fixed ContainerInjectionInterface comment is wrong, causing developers to use the wrong 'use' statement.

Issue #2080589 by mrsinguyen: Remove Unused local variable $breakpoints from /core/modules/picture/lib/Drupal/picture/Tests/PictureAdminUITest.php.

Issue #2081145 by beowulf1416: Remove Unused local variable $translations from lib/Drupal/content_translation()/ContentTranslationController.php.

Issue #2085957 by tankerjoe: Document that BookController methods return render arrays, not strings.

Issue #2080351 by mrsinguyen: Remove Unused local variable $form_html_id from /core/modules/system/lib/Drupal/system/Tests/Ajax/MultiFormTest.php.

Issue #2080347 by mrsinguyen: Remove Unused local variable $result from /core/modules/system/lib/Drupal/system/Tests/System/TokenReplaceTest.php.

Issue #2080333 by mrsinguyen, lorique: Remove Unused local variable $instance from /core/modules/system/lib/Drupal/system/Tests/File/ReadOnlyStreamWrapperTest.php.

Issue #2080345 by mrsinguyen: Remove Unused local variable $base_url() from /core/modules/system/lib/Drupal/system/Tests/System/CronRunTest.php.

Issue #2080339 by mrsinguyen: Remove Unused local variable $routes from /core/modules/system/lib/Drupal/system/Tests/Routing/RouteProviderTest.php.

Issue #2080337 by mrsinguyen: Remove Unused local variable $message from /core/modules/system/lib/Drupal/system/Tests/Mail/MailTest.php.

Issue #2080573 by Haza: Remove Unused local variable $replies from /core/modules/comment/lib/Drupal/comment/Tests/CommentPagerTest.php.

Issue #2081205 by mrsinguyen: Remove Unused local variable $rid from /core/modules/user/lib/Drupal/user/Form/UserPermissionsForm.php.

Issue #2081197 by smiro: Remove Unused local variable $links from /core/modules/hal/lib/Drupal/hal/Normalizer/EntityNormalizer.php.

Issue #2080571 by mrsinguyen: Remove Unused local variable $id from /core/modules/comment/lib/Drupal/comment/Entity/Comment.php

Issue #2080069 by mrsinguyen: Remove Unused local variable $stripe from /core/modules/system/system.admin.inc.

Issue #2060119 by tidrif, undertext, damiankloip: Convert FieldPluginBase constants to class constants.