Remove isScopeActive() cause of deprecation

In Symfony 2.4 the request_stack Service was added. It is the "Best Practice" way to catch the current request

Author: DZunke

Decoda/DecodaManager.php

@@ -490,8 +490,9 @@ private function getPhpEngine()
     private function getLocale()
     {
         if (null === $this->locale) {
-            if ($this->container->isScopeActive('request') && $this->container->has('request')) {
-                $this->locale = $this->container->get('request')->getLocale();
+            $request = $this->container->get('request_stack')->getCurrentRequest();
+            if (null !== $request) {
+                $this->locale = $request->getLocale();
             } else {
                 $this->locale = $this->options['default_locale'];
             }