Translating another site

I have bumped into a website like 100 times in the last years when looking in Google. This website is in English and I think I could sell something very good if I translate it to Spanish exactly as it is, cos many Latin Americans don't know English.

By translating I mean copy-paste into google translation and then copy that translation as a post in a blog.

Will Google consider it a copy and not rank the translated articles? Or it will?

What do you think?

Thanks

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