Sonata Admin translations with default content - symfony

Question

I was able to setup Sonata Admin with translated entities using Gedmo Doctrine Extensions:
# Doctrine Extensions Configuration
stof_doctrine_extensions:
default_locale: '%locale%'
orm:
default:
timestampable: true
blameable: true
translatable: true
# Sonata Translation Configuration
sonata_translation:
locales: [en, fr, it]
default_locale: '%locale%'
gedmo:
enabled: true
However every time I create a new entity, the translatable fields in the other languages starts empty.
English language selected:
Italian language selected:
It becomes very difficult to translate items if I don't know what they are in English.
Is there an option so that when I create an entity in English it populates also the entities in the other languages with the same content?

Answer 1

You should add fallback option to fields you need:
/**
* #var string
*
* #Assert\NotBlank()
*
* #Gedmo\Translatable(fallback=true)
*
* #ORM\Column(type="string", length=255)
*/
private $title;

Answer 2

I guess You forget to load the event listener service.
For each Gedmo extension (Timestampable, Blameable, Translatable etc. ) you have to register service in your service container.
For Translatable:
## app/config/services.yml
services:
## ...
gedmo.listener.translatable:
class: Gedmo\Translatable\TranslatableListener
tags:
- { name: doctrine.event_subscriber, connection: default }
calls:
- [ setAnnotationReader, [ #annotation_reader ] ]
- [ setDefaultLocale, [ %locale% ] ]
- [ setTranslationFallback, [ false ] ]