Issue #2665992 by alexpott, klausi, heykarthikwithu, xjm, tstoeckler: @file is not required for classes, interfaces and traits

Issue #2618886 by alexpott: LocalePluralFormatTest::testPluralEditDateFormatter() is failing randomly

Issue #2600396 by mpdonadio, justAChris, tstoeckler, skyredwang, jhodgdon, Gábor Hojtsy, Matze202: DateFormatter::formatDiff passes an invalid language code TranslationInterface::formatPlural() leading to duplicated translations and untranslatable strings

Issue #2576533 by alexpott, stefan.r, Wim Leers, dawehner, xjm, effulgentsia, catch: Rename SafeStringInterface to MarkupInterface and move related classes

Issue #2570107 by alexpott: Make format_plural() return a PluralTranslatableString object to remove reliance on a static, unpredictable safe list

Issue #1392754 by tss, justAChris, jhodgdon: Comply with new documentation standards for @file for namespaced class files

Issue #2454859 by Gábor Hojtsy, alexpott, mrjmd: Not possible to format plural an already translated string

Issue #2309737 by rpayanm, hussainweb, max-kuzomko, herom, millerbennett, ianthomas_uk, quietone, Sutharsan, sumitmadan, toddmbloom: Remove deprecated format_plural usage

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

Issue #697760 by sun: Replace getInfo() in tests with native phpDoc + annotations (following PHPUnit).

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

Issue #2074037 by Wim Leers, effulgentsia: Add drupalPostUrl() — drupalPost()/drupalPostAjax() are for forms only, D8 JS performs non-form HTTP requests.

Issue #1978916 by likin, YesCT, disasm, ayelet_Cr, tim.plunkett, vijaycs85, Letharion: Convert locale_translate_page() to a Controller.

This reverts commit 8ce27f22.

Issue #1797364 by dcam,  lazysoundsystem, Lars Toomre, neetu morwani, izus, boran, xjm: Remove t() from test asserts in locale module

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

Issue #1915302 by jessebeach, effulgentsia: Provide an API for aria-live region update announcements that module developers may leverage.

Issue #1711070 by kid_icarus, tim.plunkett, xjm, droplet, zendoodles and cam8001: Convert tests to use ::$modules property instead of parent::setUp($modules).

Issue #1452188 by Schnitzel, droplet, Sutharsan, Bojhan, Kristen Pol, Gábor Hojtsy, ershov.andrey, perusio, nod_, rvilar, andypost: Added New UI for string translation.