Made a little tweak to placeholders, to remove uneeded space.

admin/controllers/validation_rules.php

@@ -102,5 +102,5 @@ class ComponentbuilderControllerValidation_rules extends JControllerAdmin
 		$message = JText::_('COM_COMPONENTBUILDER_IMPORT_FAILED');
 		$this->setRedirect(JRoute::_('index.php?option=com_componentbuilder&view=validation_rules', false), $message, 'error');
 		return;
-	}  
+	}
 }