Issue #1889394 by droplet, nod_: Choose one JS debounce function.
Issue #1938184 by Xano, ParisLiakos, franskuipers, clemens.tolboom: Convert Drupal\Core\Utility\Color\ColorTest to PHPUnit.
Issue #1996644 by abghosh82 | joachim: Fixed user_login_name_validate() uses isset() where other user login form validation handlers use !empty().
Issue #1620010 by dawehner, ParisLiakos, plach, jibran: Move LANGUAGE constants to the Language class.
Issue #1998258 by nick_schuch: Fixed All term href's on overview page are 'taxonomy/term/()' instead of 'taxonomy/term/1'.
Issue #1962806 by mtift: Remove Drupal\taxonomy\Tests\HooksTest and taxonomy_test().module.
Issue #1909418 by tim.plunkett, damiankloip, larowlan, dawehner, kim.pepper: Allow Entity Controllers to have their dependencies injected.
Merge branch '8.x' into 2003482