add validation to aggregator and filters

Export/Aggregator/AgeAggregator.php

@@ -22,6 +22,9 @@ namespace Chill\PersonBundle\Export\Aggregator;
 use Chill\MainBundle\Export\AggregatorInterface;
 use Doctrine\ORM\QueryBuilder;
 use Symfony\Component\Form\Extension\Core\Type\DateType;
+use Chill\MainBundle\Export\ExportElementValidatedInterface;
+use Symfony\Component\Validator\Context\ExecutionContextInterface;
+use Symfony\Component\Translation\TranslatorInterface;
 
 /**
  * 
@@ -30,6 +33,17 @@ use Symfony\Component\Form\Extension\Core\Type\DateType;
  */
 class AgeAggregator implements AggregatorInterface
 {
+    /**
+     *
+     * @var 
+     */
+    protected $translator;
+    
+    public function __construct($translator)
+    {
+        $this->translator = $translator;
+    }
+
     
     public function addRole()
     {
@@ -67,7 +81,7 @@ class AgeAggregator implements AggregatorInterface
             }
             
             if ($value === NULL) {
-                return "no data";
+                return $this->translator->trans("without data");
             }
             
             return $value;