Получить язык браузера
var userLang = navigator.language || navigator.userLanguage;
alert ("The language is: " + userLang);
dcbert
var userLang = navigator.language || navigator.userLanguage;
alert ("The language is: " + userLang);//detect the language preference of the user's browser
var userLanguage = window.navigator.userLanguage || window.navigator.language;<script type="text/javascript">
var userLang = navigator.language || navigator.userLanguage;
alert ("The language is: " + userLang);
</script>