Why does Chrome incorrectly determine page is in a different language and offer to translate?
Update: according to Google
We don’t use any code-level language information such as lang attributes.
They recommend you make it obvious what your site's language is.Use the following which seems to help although Content-Language is deprecated and Google says they ignore lang
<html lang="en" xml:lang="en" xmlns= "http://www.w3.org/1999/xhtml"><meta charset="UTF-8"><meta name="google" content="notranslate"><meta http-equiv="Content-Language" content="en">If that doesn't work, you can always place a bunch of text (your "About" page for instance) in a hidden div. That might help with SEO as well.
EDIT (and more info)
The OP is asking about Chrome, so Google's recommendation is posted above. There are generally three ways to accomplish this for other browsers:
W3C recommendation: Use the
langand/orxml:langattributes in the html tag:<html lang="en" xml:lang="en" xmlns= "http://www.w3.org/1999/xhtml">UPDATE: previously a Google recommendation now deprecated spec although it may still help with Chrome. :
meta http-equiv(as described above):<meta http-equiv="Content-Language" content="en">Use HTTP headers (not recommended based on cross-browser recognition tests):
HTTP/1.1 200 OKDate: Wed, 05 Nov 2003 10:46:04 GMTContent-Type: text/html; charset=iso-8859-1Content-Language: en
Exit Chrome completely and restart it to ensure the change is detected. Chrome doesn't always pick up the new meta tag on tab refresh.
I added lang="en" to the doctype declaration, added meta tags for charset utf-8 and Content-Langauge in the HTML header, specified charset as utf-8 and Content-Language as en in the HTTP response headers and it did nothing to stop Chrome from declaring my page was in Portuguese. The only thing that fixed the problem was adding this to the HTML header:
<meta name="google" content="notranslate">But now I've prevented users from translating my page that is clearly in English to their own language. Poor job, Chrome. You can be better than this.
Without knowing what the text was, perhaps the ngram detection is being tricked by the content of your page.
http://googleresearch.blogspot.com/2006/08/all-our-n-gram-are-belong-to-you.html