Issue #2300853 by joshi.rohit100: Remove language() method from bootstrap.inc as it is deprecated.
Issue #2301577 by ParisLiakos, joshi.rohit100: Remove drupal_alter() as it is deprecated.
Issue #2301587 by joshi.rohit100: Remove form_state_defaults() as it is deprecated.
Issue #2301601 by joshi.rohit100: Remove drupal_validate_form() as it is deprecated.
Issue #1587270 by klausi, greggles, sun: Forbid execution of PHP files in subfolders by default (except those needed by core).
Issue #2296237 by er.pushpinderrana: Replace check_plain() to Drupal\Component\Utility\String::checkPlain() in file module.
Issue #2302261 by benjy: Fixed Typo in migrate.schema.yml.
Issue #2301875 by dawehner, plach: Fixed Invalid SQL when running tests.