An array of entity translation metadata.
An associative array keyed by translation language code. Every value is an array containing the translation status and the translation object, if it has already been instantiated.
Type: array
protected $translations = array();
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Entity!ContentEntityBase.php/property/ContentEntityBase::translations/8.1.x