I know this thread has been inactive for a while, but thought I'd add my two cents on http://www.municion.org. If, instead of clicking on the link, you instead Google "municion", the site pops up in the list looking like this:

MUNICION.ORG- [ Translate this page ] Coleccionismo de cartuchería, identificación, bases de datos y foros.
http://www.municion.org/ - 2k - Cached - Similar pages

Just click on [Translate this page] and Google does just that.