Issue #1668866 by ParisLiakos, aspilicious, tim.plunkett, pdrake, g.oechsler, dawehner, Berdir, corvus_ch, damiankloip, disasm, marcingy, neclimdul: Replace drupal_goto() with RedirectResponse.

Issue #2014037 by hussainweb, kgoel: Replace drupal_container() with Drupal::keyValue() in the update module.

Issue #1998140 by dawehner, ParisLiakos, tim.plunkett: Remove backward compatible ControllerInterface.

Issue #1987066 by Kevin Morse, JohnAlbin, rteijeiro, echoz, ry5n: Rename files to match CSS file naming convention.

Issue #1938822 by sandhya.m, EllaTheHarpy, tim.plunkett, alexpott, YesCT: Convert update_status() to a new-style Controller.

Revert "Issue #1938822 by sandhya.m, EllaTheHarpy: Convert update_status() to a new-style Controller."

This reverts commit c7d74b3c.

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

Issue #1937600 by Berdir, rootatwc | webchick: Determine what services to register in the new Drupal class.

Issue #1561362 by Niklas Fiekas, chrisdolby, mtift: Change file_transfer() to use BinaryFileResponse.

Issue #1547008 by Berdir, Sutharsan: Replace Update's cache system with the (expirable) key value store.

Issue #1793042 by webchick: Fixed Notice: Use of undefined constant langcode in _update_message_text() (line 605 of update.module) when installing Drupal 8.x.

Issue #986888 by bfroehle, bdone, grwgreg: Fixed Undefined index warning in 'Available Updates List' with hidden=TRUE base themes.

Issue #1879732 by vijaycs85, Gábor Hojtsy: Fixed Language-related modules not listed on available updates page.

Issue #1833516 by Berdir, chx, catch, webchick: Add $settings for low-level configuration - move things out of .

Issue #1810880 by Albert Volkman, vijaycs85, barbun, alexpott: Convert update_last_check() and update_last_email_notification() variables to CMI system.

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 #1754208 by PrabhuG, webflo, savithac, Gábor Hojtsy: Convert hook_mail() and hook_mail_alter() to langcode.

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

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

Issue #1343768 by JamesOakley, eMPee584: Fixed make update_calculate_project_update_status() work nicely with HEAD releases.

- Patch #1697170 by tobiasb, nick_schuch, adamdicarlo, dagmar: convert menu_configure() to new configuration system.