A static cache of translated language lists.
Array of arrays to cache the result of self::getLanguages() keyed by the language the list is translated to (first level) and the flags provided to the method (second level).
Type: \Drupal\Core\Language\LanguageInterface[]
\Drupal\Core\Language\LanguageManager::getLanguages()
protected $languages = array();
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Language!LanguageManager.php/property/LanguageManager::languages/8.1.x