Issue #1798732 by Dean Reilly, westie, alexpott: Convert install_task() variable to use state system.

Issue #1751150 by lewisnyman, moshe weitzman, jessebeach: Improve usability of forms on touch screen and small screen devices.

Issue #1811068 by xjm: Fixed MenuNodeTest improperly uses the node front page when checking for menu links.

Issue #1802072 by fubhy, Stalski: Ajax callbacks should be callbacks defined as function or class method.

Issue #1263302 by andypost, peterpoe: Fixed States API disabled state handler filters out nonexistent class 'form-element'.

Issue #1809962 by Jose Reyero, sun: Move some locale updates to update.inc for a safe language upgrade.

Issue #1742894 by Sutharsan, webflo, attiks, Gábor Hojtsy: Added Get status of local and remote translation files.

Issue #1786990 by effulgentsia, tim.plunkett, andypost, sun: Fixed [Module]Bundle is registered too late in WebTestBase::setUp().

Issue #1808112 by sun: Fixed Missing method visibility, bogus phpDoc and coding style in Cache backend classes.

Issue #1803338 by chx, katbailey, jthorson, Crell: Fixed 403 and 404 pages call error_log() cluttering server error logs.

Issue #1431658 by Albert Volkman, xjm, kid_icarus, ChinggizKhan, rgristroph, connork: Massive API docs cleanup for system tests

Issue #1778942 by yched, tstoeckler, andypost: Fixed Discovery::getDefinition() / getDefinitions() : inconsistent return values for 'no result.
git commit -am Issue

Issue #1611430 follow-up by Berdir: Move call to file_create_url() to later in the verbose mode process.

Issue #1717678 by andypost, Berdir, attiks: Fixed Entity::createDuplicate() does not account for uuid property.

Issue #1788462 by samhassell: Remove references to 'active store' in comments for configuration system.

Issue #1608842 by chx, alexpott, sun, effulgentsia, beejeebus, tim.plunkett et al: Replace list of bootstrap modules, enabled modules, enabled themes, and default theme with config.

Issue #1480854 by tim.plunkett, Noyz, Bojhan, yoroy, kika: Convert operation links to '#type' => 'operations'.

Issue #1620114 by Rob Loach, sun: Explicitly register \Drupal\Component and \Drupal\Core to increase class lookup performance.