Issue #2288793 by YesCT, jamesdixon, xq1003, fran seva, Les Lim: Add missing and fix some types in core docblocks and add some typehinting for locale module.

Issue #2336743 by webflo, penyaskito, YesCT, Gábor Hojtsy: Fixed When more than one language is added in the profile, the installer ignores those.

Issue #2340251 by iMiksu, alexpott, tim.plunkett, dawehner, Wim Leers: Remove most remaining url() calls.

Issue #2062103 by penyaskito, pp, nonsie | hass: Fixed Skipped translation import shows dblog link message that is not yet available in installer.

Issue #2311859 by Gábor Hojtsy, jhodgdon: Fixed Configuration and Javascript translation not created/updated in .po translation import.

Issue #1533250 by YesCT, fran seva, TravisCarden, xjm, sriharsha.uppuluri | NROTC_Webmaster: Many coding standards clean-ups in locale module.

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

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

Issue #1978918 by likin, Luxian, vijaycs85, Pancho, disasm: Convert locale_translate_import_form to a Controller.

Issue #2166915 by ianthomas_uk, sun | plach: Remove uses of deprecated language functions in tests and procedural code.

Issue #1978924 by tim.plunkett, ParisLiakos, disasm, Luxian, vijaycs85, YesCT, vaibhavjain, Pancho: Convert locale_translate_export_form to a Controller.

Issue #2187735 by ianthomas_uk, Sutharsan, andypost: Add removal information to docblock of all @deprecated functions.

Issue #2177667 by InternetDevels | jessebeach: Replace theme() with drupal_render() in locale.bulk.inc.

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.

Issue #2002650 by mrsinguyen, chertzog, legolasbo, Erik Erskine, rhm50, sandergo90, grisendo, targoo, janstoeckler, maximpodorov, beowulf1416: Improve maintainability by removing unused local variables.

Issue #1754246 by webflo, swentel, penyaskito, andypost, alexpott, YesCT, dagmar: Languages should be configuration entities.

Issue #2029075 by kfritsche, penyaskito: Fixed Configuration translation step in the installation takes a reeeeaaallly long time when installing in a non-English language.

Issue #2011102 by kgoel, DmitryDrozdik: Replace drupal_container() with Drupal::service() in the locale module.

This reverts commit c4e52bb6.

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

Issue #1905152 by Gábor Hojtsy, Jose Reyero, vijaycs85, YesCT, penyaskito: Integrate config schema with locale, so shipped configuration is translated.

Issue #625958 by slashrsm, quicksketch, eojthebrave, droplet, danlinn, czigor: Support Uploading Multiple Files for HTML5 Browsers via #multiple attribute.

Issue #1496480 by mrf, disasm, kbasarab, pfrenssen, cam8001, typhonius, Letharion, ACF, vijaycs85, heyrocker, Berdir, alexpott: Convert file system settings to the new configuration system.

Issue #1884182 by Gábor Hojtsy, Sutharsan: Fixed Import of large number of translations fails on SQLite.