Pulsa en la imagen
Cual es el idioma del navegador

     function getBrowserName() {
        var txt = "";
        txt += "< p >Browser CodeName: " + navigator.appCodeName + "< /p>";
        txt += "< p >Browser Name: " + navigator.appName + "< /p>";
        txt += "< p >Browser Version: " + navigator.appVersion + "< /p>";
        txt += "< p >Cookies Enabled: " + navigator.cookieEnabled + "< /p>";
        txt += "< p >Browser Language: " + navigator.language + "< /p>";
        txt += "< p >Browser Online: " + navigator.onLine + "< /p>";
        txt += "< p >Platform: " + navigator.platform + "< /p>";
        txt += "< p >User-agent header: " + navigator.userAgent + "< /p>";

        document.getElementById("demo1").innerHTML = txt;
      }

      function myFunctionBrowser() {
        var x = "Language of the browser: " + navigator.language;
        document.getElementById("demo2").innerHTML = x;
      }