Issue #1635084 by webflo, vasi1186: Added Track import status of files in the locale .po file directory.

Issue #258785 by Désiré, Schnitzel, kbasarab, pkiraly, desbeers, Bojhan, voxpelli, clemens.tolboom, Artusamak, Gábor Hojtsy, dvinegla: Added Provide more flexible settings for initial language on content types.

Issue #1635134 by hairqles, floretan, webflo: Move date format translation functions from locale to system.

Issue #1637710 by Schnitzel, vasi1186: Fixed Pass on language weight to language_locked_languages() when available.

Issue #1641166 by Schnitzel: Fixed Undefined property: Drupal\Core\Language\Language:: in language_list().

Issue #1640050 by Schnitzel: Fixed Locale summary in language table should be 'not applicable' for locked languages.

Issue #1591686 by greg.1.anderson: Add copyright and authors files to Twig directory and COPYRIGHT.txt

Issue #1596598 by mr.baileys: Mak drupal_goto docs say what happens if path arg is empty, and clarify that on url docs too

Issue #1630264 by vasi1186, fubhy, Gábor Hojtsy: Move field language fallback code from Locale to Field and field language handling for nodes to Node.

Issue #1471432 by Gábor Hojtsy, vasi1186, tobiasb, kalman.hosszu, Schnitzel, nod_, pixelite, dawehner: Rework language_list(), let people use more special languages.

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

- Patch #1617208 by effulgentsia, neclimdul: after kernel patch, module_hook_info() returns an empty array when called by load callback, access callback, or hook_init().

Issue #1598610 by aspilicious: Convert symfony.test to PSR-0 and remove all the files[] instances in system.info.

Issue #1538478 by Niklas Fiekas: Register lib/ directories of themes as PSR-0 roots for Drupal$theme namespace.