Issue #2573975 by alexpott, juampynr, Berdir, edurenye: function_exists check in PluralTranslatableString is wrong

(cherry picked from commit 01adbc00)

Issue #2609874 by tstoeckler, mikeker, Kristen Pol, tassilogroeper: Boolean field "On label" and "Off label" are not translatable

(cherry picked from commit 3479333a)
(cherry picked from commit acb8752d)

(cherry picked from commit a1d5f882)

Issue #2664274 by alexpott, bojanz, fortis, Mile23, arknoll: Combination of --prefer-dist and .gitattributes confuses our vendor test cleanup

(cherry picked from commit ffbaa3f2)
(cherry picked from commit 06a0758c)

Revert "Issue #2609874 by tstoeckler, Kristen Pol, tassilogroeper: Boolean field "On label" and "Off label" are not translatable"

This reverts commit 96dc18e8.

(cherry picked from commit eeab24a3)
(cherry picked from commit ca99efc9)

Issue #2609874 by tstoeckler, Kristen Pol, tassilogroeper: Boolean field "On label" and "Off label" are not translatable

(cherry picked from commit 96dc18e8)
(cherry picked from commit b96fc994)

Issue #2638856 by bojanz, webflo, SiliconMind: Unable to install modules with core dependencies via composer

(cherry picked from commit d6f56940)

Issue #2669590 by Lendude, joe_carvajal: IntegrityConstraintViolationException using an entity reference in a view with a entity reference display

(cherry picked from commit 0ec00a50)

(cherry picked from commit afb2a792)
(cherry picked from commit 92da1fc1)

(cherry picked from commit 0af3b41f)

Issue #2281393 by ultimike, mrjmd, bdone, quietone, Xano, vendion, benjy, brockfanning, alexpott: D6->D8 Blocks - Custom titles not imported

(cherry picked from commit 3429084f)

Issue #2680057 by alexpott, dawehner, isntall: Allow to not override the simpletest results on a new test run

(cherry picked from commit 7e01fa53)
(cherry picked from commit 2e5142f4)

Issue #2658412 by leolando.tan, lokapujya, rakesh.gectcr, harsha012, thisisit, zweishar, miteshmap: Config API topic makes no mention of getEditable()

(cherry picked from commit 68a1fbc7)
(cherry picked from commit b07c29b4)

Issue #2248223 by olli, Lendude, peterg.griffin, finne, mikeker, pjonckiere, b0unty, ohthehugemanatee, zniki.ru, dawehner, jhodgdon, effulgentsia, xjm, droplet, metzlerd: Adding a new Views filter and making it exposed returns user back to list of filters

(cherry picked from commit b3ef8833)
(cherry picked from commit c5897bc3)

Issue #2679953 by malavya, subharanjan, AjitS, aditya_anurag, mikebell_, jhodgdon: Replace mentions of url() in docs

(cherry picked from commit 52786985)
(cherry picked from commit 3aafbcbe)

Issue #2684319 by TravisCarden, jhodgdon: ConfigFormBaseTrait::config() @return doxygen is inaccurate

(cherry picked from commit 8e2fa49f)
(cherry picked from commit 341e132f)

Issue #2676026 by dimaro, subharanjan, Girish-jerk, zaurav, jhodgdon: Correct documentation of ThemeNegotiatorInterface

(cherry picked from commit 6e6b09c6)
(cherry picked from commit db315e94)

Issue #2680307 by metzlerd, jhodgdon: Direct people to Services and Elements pages on API sites in a clearer way

(cherry picked from commit e0b0ed3f)
(cherry picked from commit 2f80c266)

(cherry picked from commit 054d153f)

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)
(cherry picked from commit 3a300dc3)

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 6afe3596)

(cherry picked from commit e6601681)

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 #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 5e6b9a3b)

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)

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 72d53b30)

(cherry picked from commit 40d0d0d504f2bc6234cbef72dcc7b96f9cd126c5)

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

(cherry picked from commit 7fe7b049)
(cherry picked from commit 01f0ab0f)

(cherry picked from commit 7cdd0e5a)
(cherry picked from commit 83e7787d)

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

(cherry picked from commit ec2819c2)
(cherry picked from commit 4d6abe77)

(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)

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

(cherry picked from commit b8c2f8f2)