Issue #1809962 by Jose Reyero, sun: Move some locale updates to update.inc for a safe language upgrade.

Issue #1742894 by Sutharsan, webflo, attiks, Gábor Hojtsy: Added Get status of local and remote translation files.

Issue #1608842 by chx, alexpott, sun, effulgentsia, beejeebus, tim.plunkett et al: Replace list of bootstrap modules, enabled modules, enabled themes, and default theme with config.

Issue #1785086 by Jose Reyero, Gábor Hojtsy, catch, loganfsmyth, nedjo, stella: Added Introduce a generic API for interface translation strings.

Issue #1326618 by Albert Volkman, ykhadilkar, oriol_e9g, daniel_j, xenophyle: API docs cleanup for locale module

Issue #1393392 by c960657, fubhy: Convert prefix cache clears to cache tags, then remove support for them.

Issue #1215104 by sun, lucascaro, effulgentsia: Use the non-interactive installer in WebTestBase::setUp().

Issue #1779638 follow-up by sun, alexpott, Maxtorete: Fixed another unexplained test failure in LocaleFileImportStatus->testBulkImportUpdateExisting().

Issue #1779638 by sun: Better debug for unexplained test failure in LocaleFileImportStatus->testBulkImportUpdateExisting().

Issue #1627006 follow-up by YesCT, webflo, Gábor Hojtsy: CMI conversion and minor followups to 'Collect project information for translation update'.

Issue #1658842 by penyaskito, attiks, webflo: Added Introduce a translations:// stream wrapper to access the .po file directory.

Issue #1744228 by Dave Reid, nod_, penyaskito: auto-detect the language code of an imported file by file name.

Issue #1468328 by Berdir: Move file entity info, managed file, and file usage functionality into File module.

Issue #1757078 by julien, Gábor Hojtsy, LoMo, beejeebus: Fixed When installing Drupal in a non-English language, we do not see the 'congratulations' page.

Issue #1737148 by nod_, SebCorbin, larowlan, tim.plunkett, Albert Volkman, nick_schuch, sun: Explicitly declare all JS dependencies, don't use drupal_add_js().

Issue #1750228 by Boobaa, corvus_ch: Fixed Adding a new language with empty .po file and locale.module enabled throws a fatal error.

Issue #1739994 by pp, das-peter, Gábor Hojtsy: Use the Language class universally instead of stdObj instances.

Issue #1627006 by Sutharsan, Berdir, lazysoundsystem, andypost, webflo, jepSter, MantasK, Gábor Hojtsy: Collect project information for translation update.

Issue #1646580 by chx, Jose Reyero, beejeebus: Implement Config Events and Listeners, and storage realms for localized configuration.

Issue #1637348 by vasi1186, attiks, clemens.tolboom, penyaskito: Import Gettext .po files in progressive batches to avoid time limits.

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