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

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

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

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

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.

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

Issue #2454859 by Gábor Hojtsy, alexpott, mrjmd: Not possible to format plural an already translated string

Issue #2090115 by alexpott, xjm: Don't install a module when its default configuration has unmet dependencies

Issue #2286971 by znerol, Berdir, almaudoh, cilefen: Remove dependency of current_user on request and authentication manager

Issue #2367747 by Palashvijay4O, andypost, Alienpruts, Cottser, er.pushpinderrana, gaurav.pahuja, pfrenssen, rpayanm, vadim.hirbu: Remove usage of system_rebuild_theme_data()

Issue #2433599 by Wim Leers: Ensure every (non-views) pager automatically associates a matching cache context

Issue #2419897 by penyaskito, Wim Leers, webflo: Javascript translations are loaded in the wrong order due to missing dependencies

Issue #2298687 by tstoeckler, Jose Reyero, hussainweb, rpayanm: Sequence and Mapping implement interfaces incorrectly, make them honest about what they support

Revert "Issue #2298687 by tstoeckler, Jose Reyero, hussainweb, rpayanm: Sequence and Mapping implement interfaces incorrectly, make them honest about what they support"

This reverts commit 43370336.

Issue #2298687 by tstoeckler, Jose Reyero, hussainweb, rpayanm: Sequence and Mapping implement interfaces incorrectly, make them honest about what they support

Issue #2414279 by Gábor Hojtsy, likin, askibinski: Interface translations directory: Can not set values on immutable configuration

Issue #2195183 by cleaver, sandykadam, elgordogrande, jhodgdon, joachim, Eda, hussainweb: document Batch API callbacks as callback implementations

Issue #2363099 by Gábor Hojtsy, Berdir, swentel, plach: Using translated field definition descriptions in entity schema results in different schema definitions, resulting in update.php changes

Issue #2358079 by pwolanin, Berdir: Require a specific placeholder format in db_query() in order to trigger argument expansion, and require explicit 'IN' parameter for conditions

Issue #2364157 by mpdonadio, dawehner, martin107, Berdir, pcambra, naveenvalecha, tim.plunkett: Replace most existing _url calls with Url objects

Issue #784626 by Wim Leers, Manuel Garcia, jcisio, joelpittet, Bevan, fcaspani, dcmouyard: Default all JS to the footer, allow asset libraries to force their JS to the header

Issue #2095787 by Sutharsan, Gábor Hojtsy, fran seva, adci_contributor, rpayanm: Configuration translations not updated when manually importing a .po file

Issue #2368797 by Wim Leers, dawehner, rteijeiro: Optimize ajaxPageState to keep Drupal 8 sites fast on high-latency networks, prevent CSS/JS aggregation from taking down sites and use HTTP GET for AJAX requests

Issue #2406543 by alexpott: Remove ConfigFactory::setOverrideState and ConfigFactory::getOverrideState()