Indicate which file was being parsed if an exception is thrown while …

…running translation:debug

When running the translation:debug command, if a template contains invalid twig markup,
an exception is thrown. This patch rethrows a new exception that includes the filename
being parsed in the message to aid debuging.

src/Symfony/Bridge/Twig/Translation/TwigExtractor.php

@@ -58,7 +58,12 @@ public function extract($directory, MessageCatalogue $catalogue)
         $finder = new Finder();
         $files = $finder->files()->name('*.twig')->in($directory);
         foreach ($files as $file) {
-            $this->extractTemplate(file_get_contents($file->getPathname()), $catalogue);
+            try {
+                $this->extractTemplate(file_get_contents($file->getPathname()), $catalogue);
+            } catch (\Twig_Error $e) {
+                $e->setTemplateFile($file->getPathname());
+                throw $e;
+            }
         }
     }