Issue #2392221 by er.pushpinderrana, ClientGuy, zealfire: install_run_task() and install_tasks() don't document the task structure

Issue #2453761 by Gábor Hojtsy: Views numeric formatter's plural formatting setting incompatible with many languages

Issue #2460259 by sasanikolic, ameenkhan07: Multiple calls to LocaleConfigManager::getStringTranslation can return multiple new translation objects for the same source

Issue #2458349 by Wim Leers: Route's access result's cacheability not applied to the response's cacheability

Issue #2346373 by fago, sidharrell, rteijeiro, arlinsandbulte: Data reference validation constraints are applied wrong

Revert "Issue #2457345 by vijaycs85: Remove unnecessary format lookup in \Drupal\Core\Datetime\DateFormatter::dateFormat for 'custom' format"

This reverts commit 744514b9.

This reverts commit 3ae1b68c.

Issue #2459971 by Gábor Hojtsy: The langcode key on configuration files is not explicit in configuration schema

Issue #2461063 by Wim Leers, effulgentsia: AJAX forms using #ajax broken when page caching is enabled

+ ‘SparkleShare.txt’

Issue #2457345 by vijaycs85: Remove unnecessary format lookup in \Drupal\Core\Datetime\DateFormatter::dateFormat for 'custom' format

Issue #2459407 by jhodgdon, jhedstrom: SQL syntax error when using the search_keywords filter or argument

Issue #2453059 by Wim Leers: Set default render cache contexts: 'theme' + 'languages:' . LanguageInterface::TYPE_INTERFACE

Issue #2457781 by prateekMehta, stefan.r, AjitS, hussainweb: Use Utility\Html class instead of Utility\String for decodeEntities() function

Issue #2457271 by rteijeiro, Palashvijay4O, Cottser: More cleanup of the 'themeable' documentation group

Issue #2457887 by prateekMehta, stefan.r, rpayanm, alexpott: Use Utility\SafeMarkup class instead of Utility\String for placeholder(), checkPlain(),format() functions

Issue #2401191 by jhedstrom, a_thakur, nlisgo, mohrerao: Activity Tracker shows 'Last updated' status as '45 years 1 week ago'

Issue #1847596 by amateescu, amitaibu, YesCT, Berdir, David_Rothstein, xjm, rteijeiro, ParisLiakos, webchick, Wim Leers, yched, jhodgdon, Bojhan: Remove Taxonomy term reference field in favor of Entity reference

Issue #2451679 by Wim Leers, dawehner: Validate cache contexts (+ cache contexts in some views plugins wrong)

Issue #2212069 by Gábor Hojtsy, pjonckiere, rteijeiro, cilefen: Non-English Drupal sites get default configuration in English, edited in English, originals not actually used if translated

Issue #2451665 by dawehner: Don't rebuild the route on ModuleInstaller::install() (30% installer speedup)

Issue #2428703 by Wim Leers: Add a 'user.permissions' cache context (was: "Should cache contexts be able to associate a cache tag?")

Issue #2455131 by andypost, larowlan: Field comment_field_data.field_name should be using Field API formatter

Revert "Revert "Issue #2457653 by Gábor Hojtsy: System.site langcode is both used as a file language code and a site language code""

This reverts commit 079a52b4.

Revert "Issue #2457653 by Gábor Hojtsy: System.site langcode is both used as a file language code and a site language code"

This reverts commit 364a6e9c.