For some reason, Google thinks one of my page is Chinese, even though there's no Chinese characters on the page (and it's a dot com website hosted in the US, with 99% of the content in English, and none in Chinese). It displays the date of the page in Chinese (using the characters for year and month, a quick trip to the Google language tool informs me), along with a "Translate this page" link. This is on Google.com btw, with hl=en (changing to gl=us or any other locale doesn't seem to matter).
I've done a "Fetch as Googlebot" and not seeing anything strange in the results, nor in the cached version of the page.
I haven't set a "content-language" meta tag for my website though, is this what I should be doing to prevent this? Will adding this meta tag to all the pages increase the risk of a penalty or something, given how sensitive Google seems to be recently in regards to site wide changes?
Another reason could be because the page is pretty content light, in that there isn't a lot of text on page, although what text is on there is completely in English, and the page serves a simple function which doesn't really require much text, English or otherwise.
I fear people are not clicking on this link because they don't think it's in English, even though it ranks highly (my website actually ranks first for this term, the affected page is the second ranked link. Google rightly thinks the number one ranked link is in English.
