Issue #2231693 by amitgoyal, iS: Update Powered by Drupal link.
Issue #2282125 by joshi.rohit100, mtift: Fixed Remove instances of '@return self'.
Issue #2246661 by ivanjaros: Some templates are missing 'Default theme implementation ..' statement.
Issue #2270815 by vijaycs85, Gábor Hojtsy, nvinayvinay: Make schema testing code available as generic API.
Issue #2216557 by jhodgdon, mongolito404, Berdir: Fill in @defgroup/topic docs for Testing overview.
Issue #2216533 by jhodgdon: Fill in topic/@defgroup docs for Entity API overview.
Issue #2216553 by jhodgdon, fago: Fill in @defgroup/topic docs for Typed Data.
Issue #2287193 by alexpott: Fixed checkConfigSchema() can fail to report errors.
Issue #2285795 by Gábor Hojtsy: Fixed Drupal 8 loads alpha2 translations instead of alpha12.
Issue #2279617 by thedavidmeister, mgifford: Fixed _filter_url_trim() should use Unicode::truncate().
Issue #2039449 by joshi.rohit100, joachim, lokapujya, Jalandhar, paulh, yaworsk: Fix docs for assertField methods in WebTestBase to describe how to skip value checking
Issue #2278541 by tim.plunkett, kim.pepper, Bojhan, EclipseGc: Refactor block visibility to use condition plugins.
Issue #2287385 by neclimdul: Fixed PHPUnit coverage tests.
Issue #2284111 by alexpott, Berdir, damiankloip: Fixed Exceptions caught and printed from index.php should not return a 200 status code.
Issue #2231003 by kay_v, djevans, lokapujya, seiplax | scor: GetPreparedFieldMapping() should return NULL when there are no mappings.
Issue #2005434 by alexpott, heddn, andrewmacpherson, swentel: Let 3rd party modules store extra configuration in EntityDisplay.
Issue #2286241 by YesCT: Fixed Move stray SystemLocalTasksTest to PSR-4 location.
Issue #2277705 by mashermike, juampy: Fixed Files don't have URI nor href.
Issue #2208115 by Xano, damiankloip, Crell: Add DependencySerializationTrait.
Issue #2172241 by swentel, webflo | ivanjaros: Fixed Files and image widgets completely broken.