How can I change the title?

Hello there. First I want to say thank you for this great plugin.

Now, I have just a little issue (if I can call it like that) and is that I can’t change the title that appears on the web browser. Maybe is a silly question XD, but I really don’t know how to do it, because I want to change it like: “Página no encontrada” in spanish.

Here is a screenshot: https://lh6.googleusercontent.com/_Vz8LFeN3Gqo/TbuHR6dr9oI/AAAAAAAAAUE/APeWlqcZJBA/Vida-e404%20Not%20Found%20-%20Mozilla%20Firefox_013.png

Thanks.