What does "Revision translation affected" indicate?
I found this explanation in code comments:


  If a translation has changes in a certain revision, the translation is
  considered "affected" by that revision, and will be flagged as such
  via the "revision_translation_affected" field.


http://cgit.drupalcode.org/drupal/tree/core/lib/Drupal/Core/Entity/entity.api.php#n102