Issue #2145751 by jibran, yongt9412, DuaelFr, Berdir, pnagornyak, arpad.rozsa, mbovan, Wim Leers, Nixou, effulgentsia, Fabianx, kristiaanvandeneynde, anavarre, dawehner: Introduce ENTITY_TYPE_list:BUNDLE cache tag and add it to single bundle listing

Issue #2914110 by Berdir, neclimdul, acbramley, yongt9412, Wim Leers, arpad.rozsa, kim.pepper, Fabianx, davidwhthomas, pameeela, kualee, amateescu, jibran, longwave: Shortcut hook_toolbar implementation makes all pages uncacheable

Issue #3016781 by arpad.rozsa, Berdir, catch, Wim Leers, kristiaanvandeneynde: node_node_access() is too eager in adding the user cache context — fixing this makes some pages faster

Issue #2986325 by arpad.rozsa, sleitner, Berdir, plach, timcosgrove: Browser language detection broken as soon as a request with no Accept-Language header happens