[FrameworkBundle][Configuration] Fix translator enabled_locales configuration definition

Author: fancyweb

DependencyInjection/Configuration.php

@@ -688,7 +688,7 @@ private function addTranslatorSection(ArrayNodeDefinition $rootNode)
                             ->prototype('scalar')->end()
                         ->end()
                         ->arrayNode('enabled_locales')
-                            ->prototype('scalar')
+                            ->prototype('scalar')->end()
                             ->defaultValue([])
                         ->end()
                     ->end()