There is nothing in Acrobat that will translate your files - you can certainly combine a Spanish and an English file into one and have the original content in the two different parts of the document.
If that's not what you experience, then please provide a bit more information about what you are doing, and what you are seeing.
Karl Heinz Kremer
PDF Acrobatics Without a Net
PDF Software Development, Training and More...
http://www.khkonsulting.com