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I built out a macro that uses the Google Translate API to translate text fields - it also has a feature to detect the language (it will output the detected language as well) before translating. You can take a look at the macro on our gallery here. Feel free to give it a whirl! You should be able to hijack the basic functionality to make calls to a free translation service's API as well. If you prefer the regex or matching approach, I'd take a look at the special characters specific to Spanish lexicon and try to match on those (try the tilde or inverted exclamation).