Issue #2560719 by stefan.r: Remove usage of t() string in the array keys for the database install tasks

Issue #2539848 by sdstyles, pguillard, deepakaryan1988, ankur7213: Mark EntityHandlerBase as @deprecated for 9.x

Revert "Issue #2548725 by dawehner: Fix database exception handling, causing test fails in PostgreSQL"

This reverts commit 4b7ba213.

Issue #2382985 by phenaproxima, quietone, -enzo-, benjy: Migration Files for Drupal 7 Menu & Menu Entries

Issue #2558839 by quietone, mikeryan, phenaproxima: Node builder should incorporate node type into label

Issue #2423103 by phenaproxima, quietone, miguelc303, mikeryan: Migration Files for Drupal 7 Content

Issue #2548725 by pwolanin, catch, dawehner, mradcliffe: Fix regression to menu serialization in upgrade path that causes thousands of errors in PostgreSQL

Issue #2557021 by sasanikolic, tim.plunkett: Url Filter does not correctly recognise URL's with uppercase query arguments

Issue #2560521 by dawehner, plach, larowlan, lauriii, Xano, Wim Leers, catch, jhedstrom: Javascript does not work on beta 12 => HEAD update.php

Issue #2556029 by geertvd, Jaesin, dawehner: REST views unchecking "Display all values in the same row" doesn't limit the value to one per row

Issue #2521978 by kim.pepper: core/modules/system/src/Plugin/Condition/RequestPath should use the 'url.path' cache context

This reverts commit f3040e71.

Issue #507488 by lauriii, mdrummond, Wim Leers, Manuel Garcia, pwolanin, davidhernandez, chx, jibran, andypost, dawehner, Xano, tuutti, Gábor Hojtsy, LewisNyman, maximiliam, eiriksm, borisson_, bill richardson, Fabianx, joelpittet, Jeff Burnz, xjm, webchick, Bojhan, EclipseGc, emma.maria, tim.plunkett: Convert page elements (local tasks, actions) into blocks

Issue #2548009 by larowlan, dawehner, bircher: Overridden menu links lose parent, expanded and enabled (are disabled) status on cache clear

Issue #2554151 by stefan.r, Gábor Hojtsy, plach, dawehner, csg: Test content/configuration in update database dump

Issue #2549393 by alexpott, dawehner, lauriii, andypost, xjm: Remove SafeMarkup::escape() and rely more on Twig autoescaping

Issue #2500717 by afi13, klonos, cilefen, evilfurryone: Sort entries in the site status report page alphabetically, BUT case-insensitively

Issue #2489162 by googletorp, Haza, mdrummond, DuaelFr, swentel: Can configure responsive image formatter to cause fatal error

Issue #2130307 by quietone, michaellenahan, phenaproxima, David Hernández, fastangel, eliza411: Variable to config: language.negotiation [d7]

Issue #2547933 by googletorp, jhodgdon: Code example for non deprecated use of entity_get_display is wrong

Issue #2550641 by damiankloip: Use assert() in Drupal\Core\DependencyInjection\Container::__sleep instead of trigger error

Issue #2547581 by Xano, dawehner, Berdir, alexpott: Missing configuration schemas for condition plugins