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I don't think our index is updated as fast/frequent as in other countries.
May I ask if the translation was done by a human translator (with SEO knowledge)? (as I've seen too many sites that should read something on the lines of "Cervantes in Don Quijote" or they are just a pile of gobbledegook)
1) is all your content on the same domain i.e. .com or .org? or do you have country (language) specific domains like .es and .fr?
it makes a HUGE difference
2) how have you distinguished between differnet languages? using mysite.com/en/ mysite.com/es/ - using subdomains en.mysite.com es.mysite.com
I had a site that used /en/ and /es/. We switched it to subdomains á la wikipedia and ended up doing much better.
The only other thing that I could say is you might have very few 'local' links to your spanish pages.