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

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

Issue #1987728 by Niklas Fiekas, vijaycs85: Convert language_test_subrequest() to a new style controller.

Issue #1826252 by Jeroen, benjf, wilco: Domain language negotiation broken when a base url is configured.

Issue #1998140 by dawehner, ParisLiakos, tim.plunkett: Remove backward compatible ControllerInterface.

Issue #1845034 by RobLoach, sandykadam, nick_schuch, cam8001, Gábor Hojtsy: Convert standard.inc to Drupal\Core\Language.

Issue #1987066 by Kevin Morse, JohnAlbin, rteijeiro, echoz, ry5n: Rename files to match CSS file naming convention.

Issue #1888424 by katbailey, steveoliver, twistor, beejeebus, effulgentsia: Change notice: Make Drupal's URL generation logic available to HttpKernel, and minimize code repetition/divergence.

Issue #2002348 by baldwinlouie, heddn, sillygwailo: Rename Views method advanced_render() to advancedRender().

Issue #2002986 by jastraat, rjleigh, tvlooy, Dan Reinders: Rename Views method summary_name() to summaryName().

This reverts commit c4e52bb6.

Issue #2003500 by tyjamessmith, aviindub, marlatt: Rename Views method get_value_options() to getValueOptions().

Issue #1974044 by EllaTheHarpy, IshaDakota, fjd, Schnitzel: Fixed 'Account administration pages' detection method confusing.

Issue #1620010 by dawehner, ParisLiakos, plach, jibran: Move LANGUAGE constants to the Language class.

Issue #1898034 by Cottser, jenlampton, joelpittet, Shawn DeArmond, idflood, Hydra, artofeclipse, rich.yumul, chrisjlee, gnuget, c4rl, thund3rbox: block.module - Convert PHPTemplate templates to Twig.

Issue #1927608 by EclipseGc, tim.plunkett, effulgentsia: Remove the tight coupling between Block Plugins and Block Entities.

Issue #1827448 by RobLoach, sun, jbrown, tstoeckler: Use __DIR__ instead of DRUPAL_ROOT where possible/sensible.

Issue #1987298 by tim.plunkett, quicksketch: Shorten directory structure and PSR-0 namespacing for plugins.

Issue #1977784 by YesCT, Gábor Hojtsy, EllaTheHarpy: Content language settings configuration page needs to determine what entities and bundles to include.

Issue #1922454 by thedavidmeister, steveoliver, Cottser: Gut l(), fix theme('link'), have a working framework for consistently generated links inside and outside of Twig.

Issue #1969276 by effulgentsia, tim.plunkett, EclipseGc: Refactor block plugins to make room for a BlockBase::build() implementation.

Issue #1798832 by andreiashu, Berdir, heyrocker, aspilicious, johan.gant, typhonius, ACF: Convert https to .

Issue #1925738 by tim.plunkett: Followup: Convert language's system_config_form() to SystemConfigFormBase.