Issue #2002650 by mrsinguyen, chertzog, legolasbo, Erik Erskine, rhm50, sandergo90, grisendo, targoo, janstoeckler, maximpodorov, beowulf1416: Improve maintainability by removing unused local variables.

Issue #1987390 by drupalninja99, mdrummond, Cottser, joelpittet, vinmassaro, azinoman, gnugeti, carsonevans, ezeedub: Aggregator.module - Convert theme_ functions to Twig.

Issue #2095271 by Gábor Hojtsy, tim.plunkett, YesCT: Add default tabs for routes expected by config_translation().

Issue #2095223 by pwolanin, tim.plunkett: Remove t() from LocalTaskDefault now that it's in PluginBase.

Issue #2095249 by mcjim: Change description text for admin/config/system/site-information to remove 'number of posts per page'.

Issue #2083785 by Berdir, yched, das-peter: Add support for determining which field properties are cacheable.

Issue #2077473 by dawehner, damiankloip, pwolanin: Replace local action plugin discovery with YamlDiscovery and handle routes with parameters.

Issue #2091411 by damiankloip, dawehner: Provide an easier mechanism for a route definition wrapped by module_exists().

This reverts commit 227f21b3.

Issue #2000384 by yuradoc, Damien Tournoud, alexpott: Fixed php-intl module causes problems with Date and Time fields when editing Basic Page.

Issue #2100753 by Berdir: Fixed route_parameters break lazy-save logic in MenuLinkStorageController::save().

Issue #1952062 by vijaycs85, willyk, pfrenssen, vasi1186, CMS Dude, manningpete, penyaskito, kfritsche, Gábor Hojtsy: Remove legacy translation module in favor of content translation.

Issue #2004244 by Berdir, plach, tim.plunkett, msonnabaum, das-peter: Move entity revision, content translation, validation and field methods to ContentEntityInterface.

Issue #2080561 by mrsinguyen: Remove Unused local variable from /core/modules/dblog/lib/Drupal/dblog/Tests/DbLogTest.php.

Issue #2081127 by mrsinguyen: Remove Unused local variables from /core/modules/taxonomy/lib/Drupal/taxonomy/Plugin/Core/Entity/Vocabulary.php.

Issue #2080071 by rhm50: Remove Unused local variable $base_url() from /core/modules/system/system.install.

Issue #2080591 by beowulf1416: Remove Unused local variable $uid from /core/modules/user/lib/Drupal/user/Plugin/views/field/Language.php.

Issue #2080019 by mrsinguyen: Remove Unused local variable $js_hide from /core/modules/system/lib/Drupal/system/Form/PerformanceForm.php.

Issue #2080649 by mrsinguyen: Remove Unused local variable $array from /core/modules/field/lib/Drupal/field/Plugin/views/field/Field.php.

Issue #2080065 by Pete B: Remove Unused local variable $node from /core/modules/node/lib/Drupal/node/Tests/Views/FilterUidRevisionTest.php.

Issue #2080367 by mrsinguyen: Remove Unused local variable from core/tests/Drupal/Tests/Component/PhpStorage/MTimeProtectedFileStorageTest.php.

Issue #2080655 by chertzog: Remove Unused local variable  from /core/modules/locale/lib/Drupal/locale/Tests/LocaleConfigTranslationTest.php.

Issue #2062213 by duozersk: Fixed Remove Unused local variable  from /core/lib/Drupal/Core/StreamWrapper/LocalStream.php.

Issue #1751194 by Cottser, mikl, effulgentsia, benjifisher: Introduce hook_theme_suggestions_HOOK() and hook_theme_suggestions_HOOK_alter().

Issue #2100303 by Xano, dawehner, pwolanin: Fixed HEAD BROKEN: call to undefined function in ViewEditTest.php.