This module reminds you to update all translations when saving a translatable entity if it has existing translations. You can configure which entity types and bundles trigger this reminder.
This lightweight module displays a reminder message when saving a translatable entity, prompting you to update all its translations if the entity has been translated.
Features
The reminder message can be enabled per entity type and bundle which is configured to be translatable.
Post-Installation
Go to /admin/config/regional/entity-translation-reminder to configure the entities for which you want to display the reminder.
Additional Requirements
Drupal Core's "Content Translation" module (content_translation).