Issue #2457887 by prateekMehta, stefan.r, rpayanm, alexpott: Use Utility\SafeMarkup class instead of Utility\String for placeholder(), checkPlain(),format() functions

Issue #2384863 by Gábor Hojtsy, vijaycs85, rodrigoaguilera: Translation language base field handler should use views field handler, provide unified options

This reverts commit 574b0ebd.

Issue #2225427 by ianthomas_uk, martin107, JeroenT, LoMo: Remove remaining uses of deprecated language functions (mostly in object oriented code)

Issue #1879930 by fran seva, Gábor Hojtsy, martin107, markie, Schnitzel, alexpott, Sutharsan, mon_franco, YesCT, spearhead93, herom, Désiré: Fixed Language selectors are not showing localized to the page language.

Issue #2226533 by martin107, filijonka, YesCT, Xano, jmolivas, Chris Dart, alexpott, tstoeckler, visabhishek | csg: Changes to the Language class due to the LanguageInterface (followup).

Issue #2341341 by YesCT, martin107, vijaycs85, fran seva: Change public 'name' property access on languages to getName() and add back setName().

Issue #2340667 by YesCT, Pedro Lozano, alexpott, martin107: Protect Drupal\Core\Language\Language::id, and use getId().

Issue #2070737 by herom, EllaTheHarpy, alexpott: Change values of LanguageInterface::DIRECTION_(LTR/RTL) to ('ltr'/'rtl').

Issue #2347465 by tim.plunkett, dawehner, cilefen: Convert all instances of #type link/links to convert to use routes.

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

Issue #2337847 by alexpott, YesCT, martin107: The negotiated method_id does not need to be sorted on the Language or ConfigurableLanguage object.

Issue #2334763 by alexpott: Tidy up of LanguageInterface - removal of setters and other unnecessary methods.

Issue #2337833 by martin107 | YesCT: Return should not have a variable name in LanguageMangagerInterface.

Issue #2107427 by penyaskito, dclavain, Gábor Hojtsy, mashermike, Aron Novak, YesCT, szato, Wim Leers, mikispeed, vijaycs85: Fixed Regression: Language names should display in their native names in the language switcher block.

Issue #2037979 by Gábor Hojtsy, Sweetchuck, jhodgdon, dawehner: Fixed 'Current user's language' views filter label is named very misleading.

Issue #2240459 by Gábor Hojtsy, penyaskito | LoMo: Fixed Applying default language fallback rules to interface translation has impressively bad results.

Issue #2318817 by alimac, martin107: Remove method setId() from core/lib/Drupal/Core/Language/LanguageInterface.

Issue #2304651 by YesCT, martin107: Fixed Core Language sort() should not work, needs to use name instead of default title.

Issue #2286403 by martin107: Inconsistent use of magic number when constants DIRECTION_LTR and DIRECTION_RTL already defined.

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

Issue #2246657 by tstoeckler, YesCT: $options is misnamed in Language::__construct() should be property values.

Issue #2240463 by robertdbailey, balagan, holly.ross.drupal: Fix text: languages are not "enabled/disabled" anymore, they are added/removed.

Issue #2239407 by holly.ross.drupal, YesCT, tstoeckler, alimac: Language manager interface should not specify implementation details for getLanguages on the interface.

Issue #1512424 by Xano, YesCT, RobLoach: Add a LanguageInterface, and property setters/getters to Language class.

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

Issue #2190643 by Berdir, amateescu, Xano, yched: Serializing the container is a very very bad idea, let's prevent it?.