Translatable Doctrine Entity in Typo3 Flow 2.1

Gallery.php

<?php
namespace My\Gallery\Domain\Model;

use TYPO3\Flow\Annotations as Flow;
use Doctrine\ORM\Mapping as ORM;
use Gedmo\Mapping\Annotation as Gedmo;
use Gedmo\Translatable\Translatable;

/**
 * Domain Model of a Gallery
 *
 * @Flow\Entity
 * @ORM\Table(indexes={
 *     @ORM\Index(name="name_idx", columns={"name"}),
 *     @ORM\Index(name="createdAt_idx", columns={"createdAt"}),
 *     @ORM\Index(name="updatedAt_idx", columns={"updatedAt"})
 * })
 * @Gedmo\TranslationEntity(class="My\Gallery\Domain\Model\Translation\GalleryTranslation")
 */
class Gallery implements Translatable {

    /**
     * @Flow\Transient
     * @Gedmo\Locale
     * Used locale to override Translation listener`s locale
     * this is not a mapped field of entity metadata, just a simple property
     */
    protected $locale;

    /**
     * Name
     *
     * @var string
     * @Flow\Validate(type="NotEmpty")
     * @Flow\Validate(type="StringLength", options={ "minimum"=1, "maximum"=50 })
     * @Gedmo\Translatable
     */
    protected $name;

    /**
     * Description
     *
     * @var string
     * @ORM\Column(type="text")
     * @Gedmo\Translatable
     */
    protected $description;

    /**
     * Create date
     *
     * @var \DateTime
     * @ORM\Column(type="datetime")
     * @Gedmo\Timestampable(on="create")
     */
    protected $createdAt;

    /**
     * Last update date
     *
     * @var \DateTime
     * @ORM\Column(type="datetime")
     * @Gedmo\Timestampable(on="update")
     */
    protected $updatedAt;

    /**
     * Set translatable locale
     *
     * @param string $locale
     */
    public function setTranslatableLocale($locale) {
        $this->locale = $locale;
    }

    /**
     * @return string
     */
    public function getName() {
        return $this->name;
    }

    /**
     * @param string $name
     */
    public function setName($name) {
        $this->name = $name;
    }

    /**
     * Set description
     *
     * @param string $description
     */
    public function setDescription($description) {
        $this->description = $description;
    }

    /**
     * Get description
     *
     * @return string
     */
    public function getDescription() {
        return $this->description;
    }

    /**
     * @return \DateTime
     */
    public function getCreatedAt() {
        return $this->createdAt;
    }

    /**
     * @return \DateTime
     */
    public function getUpdatedAt() {
        return $this->updatedAt;
    }
}