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copied!<p>I think the main problem here is that the browser settings don't actually affect the <code>navigator.language</code> property that is obtained via javascript. </p> <p>What they do affect is the HTTP 'Accept-Language' header, but it appears this value is not available through javascript at all. (Probably why @anddoutoi states he can't find a reference for it that doesn't involve server side.)</p> <p>I have coded a workaround: I've knocked up a google app engine script at <a href="http://ajaxhttpheaders.appspot.com" rel="noreferrer">http://ajaxhttpheaders.appspot.com</a> that will return you the HTTP request headers via JSONP.</p> <p>(Note: this is a hack only to be used if you do not have a back end available that can do this for you. In general you should not be making calls to third party hosted javascript files in your pages unless you have a very high level of trust in the host.)</p> <p>I intend to leave it there in perpetuity so feel free to use it in your code.</p> <p>Here's some example code (in jQuery) for how you might use it</p> <pre><code>$.ajax({ url: "http://ajaxhttpheaders.appspot.com", dataType: 'jsonp', success: function(headers) { language = headers['Accept-Language']; nowDoSomethingWithIt(language); } }); </code></pre> <p>Hope someone finds this useful.</p> <p>Edit: I have written a small jQuery plugin on github that wraps this functionality: <a href="https://github.com/dansingerman/jQuery-Browser-Language" rel="noreferrer">https://github.com/dansingerman/jQuery-Browser-Language</a></p> <p>Edit 2: As requested here is the code that is running on AppEngine (super trivial really):</p> <pre><code>class MainPage(webapp.RequestHandler): def get(self): headers = self.request.headers callback = self.request.get('callback') if callback: self.response.headers['Content-Type'] = 'application/javascript' self.response.out.write(callback + "(") self.response.out.write(headers) self.response.out.write(")") else: self.response.headers['Content-Type'] = 'text/plain' self.response.out.write("I need a callback=") application = webapp.WSGIApplication( [('/', MainPage)], debug=False) def main(): run_wsgi_app(application) if __name__ == "__main__": main() </code></pre> <p>Edit3: Have open sourced the app engine code here: <a href="https://github.com/dansingerman/app-engine-headers" rel="noreferrer">https://github.com/dansingerman/app-engine-headers</a></p>

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