move validation on person into annotations

src/Bundle/ChillPersonBundle/Validator/Constraints/Person/BirthdateValidator.php

@@ -53,6 +53,7 @@ class BirthdateValidator extends ConstraintValidator
         if ($limitDate < $value) {
             $this->context->buildViolation($constraint->message)
                 ->setParameter('%date%', $limitDate->format('d-m-Y'))
+                ->setCode(Birthdate::BIRTHDATE_INVALID_CODE)
                 ->addViolation();
         }