Issue #2080459 by mrsinguyen: Remove Unused local variable () from /core/modules/locale/locale.install.

Issue #1374090 by droplet, Pancho, G.I.Joe, marthinal, brenda003, jfhovinne: Fixed Editing a comment still changes creation date.

Issue #2111163 by larowlan, geerlingguy: Fixed Can't Preview comments: Call to a member function id() on a non-object in comment.module, line 1371.

Issue #2004626 by plach, kfritsche, vijaycs85, Pancho, penyaskito: Make non-configurable field translation settings available in the content language settings.

Issue #2110779 by larowlan: Fixed Fatal error: Cannot use object of type Drupal\field\Entity\FieldInstance as array in Drupal/field_ui()/Form/FieldInstanceEditForm.

Issue #2080317 by rhm50: Remove Unused local variables from /core/modules/system/lib/Drupal/system/Tests/Database/SelectComplexTest.php.

Issue followup #1579810 by SeeSchloss, Albert Volkman, claudiu.cristea: Remove t() and format_string() from toolkit tests.

Issue #2065481 by EclipseGc, twistor: Fixed Make the interaction of the Annotation, Reflection & Plugin Discovery make sense.

Issue #2029857 by swentel, andrewmacpherson: Fixed Field plugin settings edit button doesn't show unless there is a settings summary.

Issue #1987636 by kgoel, tim.plunkett, pdrake, vijaycs85, pguillard, jibran: Convert block_admin_demo() to a new style controller.

Issue #2061911 by AlexandrTodorozhko, jibran, dawehner: Remove drupal_set_breadcrumb() and LegacyBreadcrumbBuilder in taxonomy module.

Issue #1987856 by mparker17, vijaycs85, sidharthap, disasm, ianmthomasuk: Convert system_timezone() to a new style controller.

Issue #2105167 by tim.plunkett: Fixed Legacy local actions are added alongside modern local actions.

Issue #2061921 by sergeypavlenko, m1r1k, alweb: Remove calls to deprecated global $user in views module.

Issue #2003498 by DmitryDrozdik, kgoel, ebeyrent, pwieck, travis-echidna, Gaelan, disasm, LinL, herom: Replace drupal_container() with Drupal::service() in the comment module.

Issue #2059965 by swentel: Remove stale comment about FieldInfo::getFieldMap() filtering data about unknown entity types.

Issue #2099679 by linclark: Fixed Changing the order of asserts in AuthTest::testRead makes them fail.

Issue #2099541 by stefan.r, Schnitzel, Gábor Hojtsy: Fixed ConfigEntities should not load the Entity translated on Edit Forms.

Issue #2025451 by amateescu, Berdir | Xano: Fixed Drupal\entity_reference()\Tests\EntityReferenceAdminTest fails on PHP 5.4.9 and libxml 2.9.0.

Needs more discussion.

This reverts commit 477a5673.