var langcodes=["fr"];

var langCode = navigator.language || navigator.systemLanguage;var lang = langCode.toLowerCase(); lang = lang.substr(0,2); var dest = window.location.href; for (i=langcodes.length-1;i >= 0; i--){if (lang==langcodes[i]){dest = dest.substr(0,dest.lastIndexOf('.')) + '-' + lang.substr(0,2) + dest.substr(dest.lastIndexOf('.')); window.location.replace ?window.location.replace(dest) :window.location=dest;}}