Issue #2013094 by pwieck, Cottser: Remove unnecessary template_preprocess() reference from all Twig files

Issue #2009664 by esunger, jeroen12345, aaronott, hussainweb: Replace theme() with drupal_render() in rdf module.

Issue #1839468 by ParisLiakos, damiankloip, dawehner, jibran: Replace aggregator rss parsing with Zend Feed.

Issue #1821844 by dawehner, jibran, damiankloip, xjm, ParisLiakos, wamilton, olli: Aggregator views integration.

Issue #2001202 by DmitryDrozdik, ebeyrent: Replace drupal_container() with Drupal::service() in the aggregator module.

Issue #2020361 by vijaycs85: Create LanguageConfigContext to activate configuration overrides based on language.

Issue #1919470 by s_leu, Berdir, Cottser, joelpittet, YesCT, Wim Leers: Add a search field to the test overview page.

Issue #2004350 by Berdir, Dean Reilly: Fixed Unserialised database connection objects don't use Drupal's PDO Statement class.

Issue #1965208 by amateescu, Berdir: Convert TaxonomyTermReferenceItem to extend EntityReferenceItem.

Issue #1936392 by Wim Leers: Configure CKEditor's 'Advanced Content Filter' (ACF) to match Drupal's text filters settings.

Issue #1668866 by ParisLiakos, aspilicious, tim.plunkett, pdrake, g.oechsler, dawehner, Berdir, corvus_ch, damiankloip, disasm, marcingy, neclimdul: Replace drupal_goto() with RedirectResponse.

Issue #2020301 by plach, Berdir: Make the $type parameter of LanguageManager::getLanguage() optional.

Issue #2015999 by damiankloip: Fields cannot be used as the row style on style plugins that support it.

Issue #1852454 by patrickd, xjm, YesCT, Berdir, amateescu, Pancho, djroshi, dealancer, Wim Leers, jessebeach: Restrict module and theme name lengths to 50 characters.

Issue #2021749 by Sutharsan: Fixed Core should not force latest version number translations on sites.

Issue #1777956 by fago, klausi, sun, dasjo: Provide a way to define default values for entity fields.

Issue #2020353 by dawehner: Comments aren't displayed in Views when using Format: Unformatted list and Show: Comment | Full comment.

Issue #1983548 by Berdir, LukyLuke_ch, giammi, effulgentsia: Convert contact message entities to the new Entity Field API.

Issue #1939066 by joelpittet, chrisjlee, Cottser, splatio, jenlampton: Convert theme_breadcrumb() to Twig.

Issue #2018409 by ParisLiakos: LocaleTranslation should have its translation property initialized as array.

Issue #2017019 by valdo, amateescu, tim.plunkett: Configuration export action path is broken when Drupal is installed in a subfolder.