Issue #1810394 by hchonov, plach, YesCT, David Hernández, Schnitzel, vijaycs85, penyaskito, tstoeckler, alexpott, Gábor Hojtsy: Site configuration with domain based language negotiation results in redirecting authenticated users to a different domain when accessing a content entity route for translation language different from the interface language

Issue #2460027 by epari.siva, vijaycs85: Update the documentation of  Drupal\language\LanguageServiceProvider::getDefaultLanguageValues()

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 #2339435 by YesCT, alexpott: Default no longer needs to be a property on Language or ConfigurableLanguage.

Issue #2337849 by martin107 | YesCT: Dont need alias in use for use Drupal\Core\Language\LanguageInterface as BaseLanguageInterface; in LanguageNegotiationMethodInterface.

Issue #2284103 by alexpott, fabpot, damiankloip, Xano, Xen, Berdir: Fixed Remove the request from the container.

Issue #2246665 by jaredsmith, martin107, YesCT, filijonka, tstoeckler: Typehint with Drupal\Core\Language\LanguageInterface instead Drupal\Core\Language\Language.

Issue #2219499 by Berdir, alexpott, Gábor Hojtsy, vijaycs85, swentel: Generalize language config override responsibility.

Issue #1862202 by plach, Berdir, katbailey, ParisLiakos, alexpott, chx, sun, larowlan, Gábor Hojtsy, cosmicdreams, vijaycs85, YesCT, penyaskito, andypost, Albert Volkman, joelpitett: Objectify the language system.