var html = document.getElementsByTagName("html")[0];
process(html);

function process(element)
{
	if (element.childNodes.length > 0)
	  for (var i = 0;i < element.childNodes.length; i++)
	    process(element.childNodes[i]);

	  if (element.nodeType == Node.TEXT_NODE && /\S/.test(element.nodeValue)) {
         getTranslation(element);
      }
}

function translate(element,input) {
	var json = JSON.parse(JSON.stringify(input)).replace(/\\+/g,"");
	var jsonresult = json.match(/(".*?"|[^",\s]+)(?=\s*,|\s*$)/g);
	resultlength = jsonresult[0].length - 2;
	result = jsonresult[0].substr(1,resultlength);
	element.textContent = result + " ";
}

function getLang() {
	var httpLang = '';
	if (httpLang.length > 0) {
		var userLang = httpLang;
	} else {
		var userLang = navigator.languages ? navigator.languages[0] : (navigator.language || navigator.userLanguage);
	}
	return userLang;
}

function getTranslation(element){
    var targetLang = navigator.languages ? navigator.languages[0] : (navigator.language || navigator.userLanguage);
	var targetLang = getLang();
    var url = "https://translate.googleapis.com/translate_a/single?client=gtx&sl=en&tl=" + targetLang + "&dt=t&q=" + encodeURI(element.textContent);
    var xmlhttp;
    xmlhttp = new XMLHttpRequest();
    xmlhttp.onreadystatechange = function(){
        if (xmlhttp.readyState == 4 && xmlhttp.status == 200){
            translate(element,xmlhttp.responseText);
        }
    }
    xmlhttp.open("GET", url, true);
    xmlhttp.send();
}