sf4 resolve errors and depreciations

Templating/TranslatableStringTwig.php

@@ -22,8 +22,10 @@
 namespace Chill\MainBundle\Templating;
 
 use Symfony\Component\DependencyInjection\ContainerAwareTrait;
+use Twig\Extension\AbstractExtension;
+use Twig\TwigFilter;
 
-class TranslatableStringTwig extends \Twig_Extension
+class TranslatableStringTwig extends AbstractExtension
 {
     use ContainerAwareTrait;
     
@@ -51,7 +53,7 @@ class TranslatableStringTwig extends \Twig_Extension
     public function getFilters()
     {
         return array(
-            new \Twig_SimpleFilter(
+            new TwigFilter(
                 'localize_translatable_string', array($this, 'localize')));
     }