Issue #1946426 by ramlev, pfrenssen, foopang, webflo, David Hernández, vijaycs85, tim.plunkett, disasm | mtift: Convert all of confirm_form() in language.admin.inc to the new form interface.

Issue #1946426 by ramlev, pfrenssen, foopang, webflo, David Hernández, vijaycs85, disasm, tim.plunkett: Convert all of confirm_form() in language.admin.inc to the new form interface.

Issue #1855402 by andypost, fubhy, tim.plunkett, dawehner, sun: Add generic weighting (tabledrag) support for config entities (ConfigEntityListController).

Issue #2068135 by rhm50: Remove Unused local variable () from /core/modules/node/lib/Drupal/node/Tests/NodeAccessLanguageTest.php.

Issue #2070791 by tstoeckler: Remove unnecessary request context futzing in \Drupal\system\Tests\Routing\RouterTest::testUrlGeneratorFront().

Issue #2060721 by legolasbo: Remove Unused local variable  from /core/modules/system/lib/Drupal/system/Plugin/Block/SystemMenuBlock.php.

Issue #2071655 by Berdir: Fixed AliasWhitelist implements CacheCollector incorrectly, resulting in cache write on every request.

Issue #2021063 by Berdir, kiamlaluno, YesCT: Use hook_entity_operation_alter() for manage fields and manage display links.

Issue #2015701 by klausi, pfrenssen, amateescu: Convert field type to typed data plugin for entity reference module.

Issue #2067881 by ZenDoodles, mradcliffe: Fixed Search is missing from block admin UI after installation.

Issue #1987858 by oenie, jibran, tim.plunkett: Convert taxonomy_autocomplete() to a new style controller.

Issue #2062151 by dawehner: Create a current user service to ensure that current account is always available.

Issue #2057869 by dawehner, jibran: Provide an alias for 'plugin.manager.entity' called 'entity.manager'.

Issue #2061835 by thedavidmeister, Cottser: Fixed theme() doesn't enforce that what it returns is a string or FALSE.

Issue #1889644 by Berdir: Convert drupal_mail_system() to a MailFactory service to allow more flexible replacements.

Issue #2067427 by Wim Leers: Fixed Drupal.editors.ckeditor.attachInlineEditor() should pass Drupal-specific settings like Drupal.editors.ckeditor.attach() does.

Issue #2029167 by oadaeh, mandarmbhagwat78: Fixed Global text textarea is hidden due a CSS problem in Firefox.

Issue #2009654 by Cottser, InternetDevels, jesse.d, Carolyn, jenlampton: Replace theme() with drupal_render() in locale module.

Issue #2009580 by pplantinga, Samvel, hussainweb, andypost, siccababes: Replace theme() with drupal_render() in image module.

Issue #2057155 by pwolanin, dawehner: Add a generateFromRoute() method on the url generator to accept options like url().

Stupid commit message. :P Fixing. :P

This reverts commit 838bf21e.