Issue #1512424 by Xano, YesCT, RobLoach: Add a LanguageInterface, and property setters/getters to Language class.
Issue #1957152 by brantwynn: Replace calls to the flood service with Drupal::flood().
Issue #1933636 by sun: PhpStorage\FileStorage tries to write a file using the same name of MTimeProtectedFileStorage's directory name.
Issue #2207229 by larowlan, jibran: Attempt to use 'Parent Term' relationship results in broken/missing handler.