Hi, I think as you offer translation services, you have an especially strong need to have real people translate the relevant parts of the website (rather than software).
With regards to geo-targeting in webmaster tools. The suggestion is to geo-target the /es folder rather than just a page. So all the Spanish elements are targeted within that folder.
Resources permitting and having a good understanding of your / your client's markets I would suggest extending this to the other Spanish speaking countries you are targeting. The nuances of language are enough to warrant this and it is an opportunity to demonstrate expertise in translation.
