Symfony 2 Multi lingual

ArticleType.php

<?php 

// namespaces etc...

class ArticleType 
{
    // ...
    
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        // ...
        // old definitions
        // ...
        
        $builder->add('translations', 'a2lix_translations');
    }

config.yml

default_locale:  "en"

doctrine:
    orm:
        mappings:
            gedmo_translatable:
                type: annotation
                alias: GedmoTranslatable
                prefix: Gedmo\Translatable\Entity
                # make sure vendor library location is correct
                dir: "%kernel.root_dir%/../vendor/gedmo/doctrine-extensions/lib/Gedmo/Translatable/Entity"
                is_bundle: false

stof_doctrine_extensions:
    default_locale: "en"
    translation_fallback: true
    orm:
        default:
            translatable: true

a2lix_translation_form:
    locales: ["en", "fr", "it"]  # [optional] Array of the translation locales (The default locale have to be excluded). Can also be specified in the form builder.
    default_required: false     

DefaultController.php

<?php

// namespaces etc...
    
class DefaultController 
{
    indexAction(Request $request)
    {
        // returns en at http://mywebsite.com/en/my-route
        // returns it at http://mywebsite.com/it/my-route
        $request->getLocale();
    }
}

MyEntity.orm.yml

MyBundle\Entity\Article:
    type: entity
    gedmo:
        translation:
            locale: locale
            entity: MyBundle\Entity\ArticleTranslation
    id:
        id:
            type: integer
            generator: { strategy: AUTO }

    fields:
        title:
            type: string
            gedmo:
                - translatable
        content:
            type: text
            gedmo:
                - translatable
    
    # This is the personal translation type
    oneToMany:
        translations:
            targetEntity: MyBundle\Entity\ArticleTranslation
            mappedBy: object
            cascade: [ persist, remove ]

routing.yml

# Before
my_route:
    pattern:            /my-route/{my_pattern}
    defaults:
      _controller: MyBundle:Default:index

# After
my_route:
    pattern:            /{_locale}/my-route/{my_pattern}
    defaults:
      _controller: MyBundle:Default:index
      _locale: en
    requirements:
      # You can restrict the lanugages you support here
      _locale: ^en|fr|it$