This module provides a developer tool to programmatically change the default language of an entity. It offers a service that allows developers to update an entity's default language, with options to decide whether to update translations and specify which languages to target.
This module provides a service for changing the default language of an entity.
No user interface for now, only a helper module for developers.
/** @var \Drupal\entity_change_default_language\EntityChangeDefaultLanguageInterface $default_language_fixer */
$default_language_fixer = \Drupal::service('entity_change_default_language');
$default_language_fixer->update(\Drupal\node\Entity\Node::load(1), 'es', TRUE, ['en']);