Issue #2683763 by amateescu: Referenceable bundles should be sorted by Label, not by their machine name

(cherry picked from commit b95c5a20)

(cherry picked from commit 2e50c28d)

Issue #2177335 by drintios, idebr, czigor, oo0shiny, bdimaggio, samiullah, alexpott: Selecting 'Disabled' does not move the block to the disabled region when there are no disabled blocks

(cherry picked from commit 866152a0)

Issue #2670978 by dawehner, isntall, jibran, alexpott: Allow to run just specific types when running all tests

(cherry picked from commit 96838913)

(cherry picked from commit e6601681)

(cherry picked from commit 99151ae7)

Issue #2609680 by alexpott, jhedstrom: Add an AssertMailTrait to allow mail testing in Kernel tests and fix odd stdout not found in test output

(cherry picked from commit e01b1cc2)

Issue #2572545 by pguillard, snehi, peezy, lokapujya, mahavir003, miteshmap, harsha012, hosttor, Manjit.Singh, HezzieB, jhodgdon: Update the UI texts for the Custom Block module

(cherry picked from commit 79bc1638)

Issue #2676816 by xjm: Consolidate miscellaneous docs from class @file docblocks into the class docblocks

(cherry picked from commit 9611d98c)

Issue #2608692 by snehi, r_sharma08, anil280988, marvin_B8, rakesh.gectcr, ashhishhh, malavya, heykarthikwithu, kaushalkishorejaiswal, jhodgdon: Revise docblock for BookManager methods

(cherry picked from commit d3d0facf)

Issue #2626106 by Wim Leers, gceja, thpoul: The image button does not work unless width+height attributes are allowed, even though those are optional

(cherry picked from commit 73dddd4c)

(cherry picked from commit d62ca100)

(cherry picked from commit 5e6b9a3b)

(cherry picked from commit 26b14bc5)

Issue #2471689 by klopez, shashikant_chauhan, harings_rob, snehi, jhodgdon: Entity API documentation should consistently refer to handlers rather than controllers

(cherry picked from commit 49a419de)

Issue #2676472 by micaelamenara, jhodgdon: docs for t() and related functions don't explain how context works

(cherry picked from commit 563ef195)

(cherry picked from commit 411a517a)

(cherry picked from commit f312afbe)

Issue #2679903 by thpoul, Dave Reid, Wim Leers: CKEditor uses separate cache-busting query string from Drupal's

(cherry picked from commit adaad5f5)

Issue #2572125 by rodrigoaguilera, vijaycs85, swentel, Berdir, Wim Leers, tstoeckler: Content translation local tasks are not getting displayed due to caching

(cherry picked from commit c5ce9cef)

(cherry picked from commit 7cd80db7)

Issue #2670444 by Wim Leers: Embedded AJAX responses aren't application/json, but application/vnd.drupal-ajax

(cherry picked from commit 8eb8e89a)

Issue #2581407 by davidhernandez, LewisNyman, emma.maria, Saphyel: Remove the obsoletely named Classy library attached to Bartik's comment.html.twig as Bartik uses its own styles.

(cherry picked from commit 47706f76)

Issue #2681753 by lluvigne, subharanjan, cilefen: "Permissions page" link in Admin > Appearance is hardcoded and breaks on subdirectory setup

(cherry picked from commit 51372ae0)

Issue #1836384 by Lendude, pguillard, dawehner, damiankloip, hynnot, tadityar, anil280988, jain_deepak, gaurav_varshney: The views UI should display "All Displays" option only when there are more 1 displays

(cherry picked from commit a888a694)

Issue #2679867 by Wim Leers, mr.baileys: BigPipe causes PHP notices with JavaScript disabled on error pages

(cherry picked from commit c6e1b960)

(cherry picked from commit 181b4bbb)

Issue #2604974 by Chi, tstoeckler, dcrocks, Edit Olah: Hide "Powered by Drupal" block title by default

(cherry picked from commit eb99b79b)

(cherry picked from commit 6aed5822)

Issue #2679096 by Berdir, dawehner, tim.plunkett: Convert Kernel Tests in Drupal\system\Tests\Entity to phpunit

(cherry picked from commit bf1a1949)

(cherry picked from commit 05c382ec)

Issue #2672512 by Birk, kurund: CKEditorPluginConfigurableInterface::settingsForm() docs don't match API usage

(cherry picked from commit 7fe7b049)

(cherry picked from commit 7cdd0e5a)

Issue #2665738 by droplet, zviryatko: jQuery Autocomplete applies "_renderItem" option only for first element on the page

(cherry picked from commit ec2819c2)

Issue #2678628 by Wim Leers: Consider removing the BigPipe no-JS cookie when JS is enabled again in a browser

(cherry picked from commit 221ab60f)

(cherry picked from commit c1b5d37d)

(cherry picked from commit 134c533f)

(cherry picked from commit 40d0d0d504f2bc6234cbef72dcc7b96f9cd126c5)

Issue #2626570 by Wim Leers, thpoul, DuaelFr: Drupal 8's custom Image and Link plugins do not include a HiDPI icon

(cherry picked from commit 0fa19e0a)

Issue #2678574 by dawehner: Symfony 2.8 requirements change: required PHP "iconv" extension is nowhere documented

(cherry picked from commit 0bbd5d3f)