That is because of the Sample Text in the preview box. Google Chrome automatically detects language other than the one you have set as your default and asks you if you want the text on that page to be translated. You can just change your browser settings if you don't want Chrome to pop that translation message every time it detects another language. :)
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Initially Google did not auto detect which language the page was in so the default was English but now they auto detect the language when you visit the webpage. They have updated their browser on 14th Jan 2014 and have updated this Translate feature. :)
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