Afaik, there aren't any automated engines that can do a good, grammar-correct job of translating entire sentences and paragraphs between languages.
The results are likely to produce bad grammar which highlights an absence of professionalism and makes the site look crunchingly amateurish.
Unless you can find a solid, 100%-faultfree engine (if such a thing exists at present, which I doubt) then I'd steer clear of trying to automate the translation process.