Issue #1834594 by effulgentsia, Rob Loach: Update dependencies (Symfony and Twig) follow up fixes for Composer.

Issue #1167350 follow-up by ry5n, dead_arm: Slightly modify colour on action links to make it WCAG AA accessible.

Issue #1804688 by Sutharsan, YesCT, clemens.tolboom, Gábor Hojtsy, webflo, Jose Reyero: Download and import interface translations.

Issue #1833440 by scor, klausi, Crell: Added Implement partial matcher based on content negotiation MIME type.

Issue #1847574 by stevector: Fixed Toolbar sets the active-trail to the last clicked menu item, not the current menu item.

Issue #1855204 by g.oechsler, effulgentsia: Fixed RouteBuilder needs to respect route options set in yaml file.

Issue #1787876 by Albert Volkman, cirage, BrockBoland: Add return docs for drupal_get_token() function

Revert "Issue #1824898 by vijaycs85, ACF: Convert drupal_weight_select_max() variable to CMI system."

This reverts commit cd8dd173.

Conflicts:

	core/modules/system/system.install

Issue #1849700 by katbailey, effulgentsia: Fixed DrupalKernel's container.modules param should contain module filenames, not full namespace paths.

Issue #1831324 by sun, effulgentsia: Form API #autocomplete_path() JS and callbacks to use GET q= parameter instead of menu tail.

Issue #1824778 by vijaycs85, ACF, pcambra, cam8001: Covert css_gzip_compression() and js_gzip_compression() variables to CMI system.