Issue #3041076 by alexpott, shaal, Gábor Hojtsy, lauriii, Wim Leers, catch, Cottser, jibran, andypost, znerol, xim, joelpittet, effulgentsia: Update Drupal 9 to Twig 2

Issue #2776975 by joelpittet, dawehner, tim.plunkett, xjm, pfrenssen: March 3, 2017: Convert core to array syntax coding standards for Drupal 8.3.x RC phase

Issue #2665992 by alexpott, klausi, heykarthikwithu, xjm, tstoeckler: @file is not required for classes, interfaces and traits

Issue #2700367 by alexpott: Consolidate miscellaneous docs from class @file docblocks into the class docblocks (part2)

(cherry picked from commit e0516e39)

Issue #2194155 by cosmicdreams, subhojit777, tatarbj, Cottser: Replace deprecated Twig_NodeInterface with recommended Twig_Node

Issue #2049241 by Mark Carver, penyaskito, Gábor Hojtsy: Change notice: Add support for language options to the Twig {% trans %} tag extension.

Issue #1927584 by Mark Carver, ezeedub, drupalninja99, Cottser, geoffreyr, John Bickar, jenlampton, penyaskito: Add support for the Twig {% trans %} tag extension.