(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)

Issue #2412569 by claudiu.cristea, amateescu, yched, jibran, epari.siva: Allow setting the auto-create bundle on entity reference fields with multiple target bundles

(cherry picked from commit a547ae61)

(cherry picked from commit 19937298)

Issue #2678550 by imrancluster: Need full stop (.) for description field's help text in Add comment type' section

(cherry picked from commit 85ef01de)

(cherry picked from commit d0a9acce)

(cherry picked from commit 64415a68)

Issue #2668008 by dimaro, kannan@kiluvai.com, rakesh.gectcr, felribeiro, jhodgdon, eojthebrave, xjm, mobaid: Internationalization topic refers to format_plural() function that does not exist

(cherry picked from commit e1d1a054)

(cherry picked from commit 6315ac43)

Issue #2614764 by snehi, priya.chat, rakesh.gectcr, anil280988, amit.drupal, jhodgdon: Wrong @param doc in class Composer

(cherry picked from commit b8c2f8f2)

(cherry picked from commit ad0a90f3)

(cherry picked from commit 3d91345e)

Issue #2623940 by alexpott, Berdir: ConfigInstaller tries to install optional config with missing dependencies

(cherry picked from commit cd068ef4)

Issue #2528498 by Wim Leers, Jacine, mortendk: Only emit Quick Edit data- attributes when actually necessary

(cherry picked from commit fa5efed8)

Issue #2672600 by borisson_, arunkumark, Mile23: Replace deprecated usage of  entity_create('node') with a direct call to Node::create() in comment,datetime,editor,field,hal,system,taxonomy,views

(cherry picked from commit 348aa684)

(cherry picked from commit 6e5de2b5)

(cherry picked from commit 74d7b55b)

Issue #2502917 by dimaro, rakesh.gectcr, DuaelFr, suhel.rangnekar: Replace deprecated usage of entity_create used with variable entity types with a direct call to EntityManager::getStorage()->create()

(cherry picked from commit 0e454b55)