Email recieved, doesn’t include custom information

Hi,

When activating a member, and sending a notification, the user doesn’t receive the correct information. They are supposed to receive their username, password and URL. What they receive is this (excuse the spanish, but i’m sure you get what they should receive):

Querido {first_name} {last_name}

?Su registro ya está completo!

Detalles de registro:
Nombre de usuario: {user_name}
Contrase?a: {password}

Inicie sesión en el área de miembros en la siguiente dirección URL:

{login_url}

Gracias

How can i fix this?

Thanks in advance,
Johan