I found this site that seems to work really well, you can click on different threads and links and it will automatically translate it.
The only thing is in order for you to log in it says an admin needs to add it to the "whitelist".
This is what is says exactly.
"In order to accept POST request originating from this domain, the admin must add this domain to the whitelist."
Maby an admin can add the site to this so called "whitelist". I have never heard of a whitelist but maby you guys will understand it. I think it would be great to find a site that will translate the forum wile your logged in, we can maby even make it a sticky for new comers.
Edit: Looks at my sig in on the translated page I linked above, it says 98' Supertaxi. Does supertaxi really mean ranger in spanish? lol