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.

Issue #2051097 by dawehner, Manuel Garcia, tlattimore, neclimdul: Change 'pattern' to 'path' in *.routing.yml files.

Issue #1939082 by shanethehat, larowlan, jenlampton, Cottser, LewisNyman, duellj, Mark Carver, joelpittet: Convert theme_status_messages() to Twig.

Issue #1614186 by RobLoach, tim.plunkett, msonnabaum, Crell, jhodgdon, Niklas Fiekas: Update coding standards for using 'native' PHP classes like stdClass in namespaced code.

Issue #1981368 by tim.plunkett, Crell, webchick: Convert all routes to 'module_name().foo_bar()' naming convention.

Issue #2041333 by tstoeckler, tim.plunkett: Inject the module handler into the entity access controller.

Issue #1987816 by pdrake, disasm, ParisLiakos, pguillard, vijaycs85, dawehner: Convert system_batch_page() to a new style controller.