translate.js

i18n.init({ lng: 'en-EN', load: 'current', fallbackLng: false }, function(t) {
  var keys = document.querySelectorAll('[data-i18n]');
  for (var i = 0; i < keys.length; i++) {
    var key = keys[i].dataset.i18n;
    var attribute = null;
    var attributeRegEx = new RegExp(/\[(\S*)\]/);

    if(key.match(attributeRegEx)){
      attribute = key.match(attributeRegEx)[1];
      key = key.replace(attributeRegEx, '');
    }

    var translation = i18n.t(key);

    if(translation){
      if(!attribute){
        keys[i].innerHTML = translation;
      } else {
        keys[i].setAttribute(attribute, translation);
      }
    }
  }
});