Issue #2220749 by gremy, Berdir, jessebeach: Limit $extension.$(config_prefix/entity_id) combo value to 83 characters (82 plus a '.') as part of a 250 character limit on config entity file names.

Issue #2149649 by Gábor Hojtsy, YesCT, Xano, herom, vijaycs85, Sweetchuck, plach: Entity rendering/theming does not use the active entity language to render links.

Issue #2226903 by pwolanin, dawehner, tvn, martin107, jessebeach: Step 1: Move static menu links to yml files.

Issue #2226233 by ckrina, alexrayu, Manuel Garcia, Cottser: Redo changes from field.module to Twig conversion issue that were clobbered.

Issue #2205295 by znerol, sun, cosmicdreams, skipyT, ParisLiakos, ianthomas_uk: Objectify session handler.

Issue #2224777 by pwolanin, dawehner: Unlimited allowed length of path in menu router allows DoS attack on Drupal 8.

Issue #2124599 by olli, tedbow, swentel: ode_block_access affects access to editing blocks Removes 'operations' links for Block layout page.

Broke Bartik, still needs discussion.

This reverts commit 5a8a34e8.

Issue #2011128 by jsbalsera, aboros, Devin Carlson, mr.baileys, pplantinga: Theme_disable() can disable the wrong theme.

Issue #1770902 by sun, InternetDevels, mbrett5062, tim.plunkett: Theme of parent site executing test leaks into all tests.

Issue #2180109 by damiankloip, dawehner, ParisLiakos, joelpittet, MartijnBraam, Xano: Change the current_user service to a proxy.

Issue #2227355 by sun: InstallerServiceProvider does not override all cache bins to use memory backend.

Issue #2120235 by dawehner, YesCT: Regression: routing / tabs / actions / contextual links lack way to attach replacement arguments to UI strings.

Issue #2153469 by Garrett Albright, olli, swentel, webchick: View page display getting re-ordered on import, leading config system to believe it hasn't been imported yet.

Issue #1957312 by ParisLiakos, peximo, Désiré: Use the entity storage controller in aggregator module.

Issue #2159369 by ParisLiakos: Move aggregator_refresh() and most of ->removeItems() logic to a service.

Issue #2122175 by dclavain, SiliconMind, tim.plunkett, YesCT: String translation does not honor language fallback.

Issue #2075475 by sqndr, Oostie, meladawy, temaruk, LewisNyman: Theme with no screenshot causes CSS height issue.

Issue #2056879 by martin107, Outi, ioskevich, Cottser: Improve twig_* vars DOCs in settings.php and make Twig debug markup require a cache clear.

Issue #2225649 by jjcarrion, LewisNyman: Action links on /admin/config/services/aggregator are inside of an <em> tag.

Issue #2226185 by galooph, filijonka, Cottser: Remove @ingroup themeable from core theme Twig template docblocks.

Issue #2219617 by visabhishek, galooph, joshtaylor, Cottser: Remove @ingroup themeable from preprocess function docblocks.