Issue #2503453 by mgifford, bobrov1989, rikki_iki, kattekrab, LewisNyman: Increase contrast on inline form error text

Issue #2398465 by DickJohnson, emma.maria, jp.stacey, idebr: Clean up the "contextual" component in Bartik

Revert "Issue #2527126 by dawehner, Wim Leers, hass: Only send cache context/tags if frontend proxy exists"

This reverts commit 7115108c.

Issue #2474151 by JeroenT, dcmul, naveenvalecha, sorabh.v6, trwad, Nitesh Sethia, sushilkr, disasm, dylanf, Mile23, xjm, dawehner, tim.plunkett, andypost: Mark procedural wrappers in entity.inc as deprecated

Issue #2398467 by lduerig, tresti88, Eski, LewisNyman, emma.maria: Clean up "dropbutton" component in Bartik

Issue #2119997 by Sharique, ursula, vijaycs85, dimaro, quietone, dawehner, mpdonadio, Bojhan: Change UI to remove display machine name for date formats

Issue #2539246 by brandon.holtsclaw, cilefen, pwolanin: Search page local task label was an XSS vector—add tests

Issue #2031883 by mortendk, rachel_norfolk, andypost, zestagio, epari.siva, nguerrier, Manjit.Singh, rteijeiro, MathieuSpil, pablo.guerino, HOG, lauriii, LewisNyman, joelpittet, Wim Leers, Cottser, minneapolisdan: Markup for: comment.html.twig

Issue #2532476 by dawehner, pwolanin, pfrenssen, Gábor Hojtsy, effulgentsia: Menu links should use a TranslationWrapper to encapsulate safe translatable strings from YAML files

Issue #2538228 by alexpott, amateescu: Document that Config save/delete/rename events may be dispatched during hook_update_N(), what that means for subscribers, and fix core subscribers accordingly

Issue #2429659 by chx, Berdir, mpdonadio, geerlingguy, Cottser, rteijeiro, Fabianx, catch, dawehner: Race conditions in the twig template cache

Issue #2535118 by longwave, Wim Leers, borisson_, effulgentsia: Toolbar subtrees not working on admin pages due to lack of theme negotiation on Toolbar's custom JSONP route

Issue #2533994 by phenaproxima: Move module-specific migration support into the block_content module

Issue #2534034 followup by mikeryan: Move module-specific migration support into the taxonomy module

Issue #2534020 by phenaproxima: Move module-specific migration support into the menu_link_content module

Issue #2540538 by znerol: Behavior of testErrorContainer() and testExceptionContainer() is unpredictable