Fix variables in translation with quites

Author: Iandenh

src/Controller/MailPreviewController.php

@@ -150,7 +150,7 @@ protected function respondWithPart($email, $partType)
         $part = $this->findPart($email, $partType);
 
         if ($part === false) {
-            throw new NotFoundException(__d('debug_kit', "Email part '{0}' not found in email", $partType));
+            throw new NotFoundException(__d('debug_kit', "Email part ''{0}'' not found in email", $partType));
         }
 
         $response = $this->response->withType($partType);

src/Panel/PanelRegistry.php

@@ -60,7 +60,7 @@ protected function _resolveClassName($class)
      */
     protected function _throwMissingClassError($class, $plugin)
     {
-        throw new \RuntimeException(__d('debug_kit', "Unable to find '{0}' panel.", $class));
+        throw new \RuntimeException(__d('debug_kit', "Unable to find ''{0}'' panel.", $class));
     }
 
     /**