Проблема с переводом статического сайта

(function($) {
  $.fn.translate = function(options) {

    var that = this; //a reference to ourselves

    var settings = {
      css: "trn",
      lang: "en"
      /*,
      t: {
        "translate": {
          pt: "tradução",
          br: "tradução"
        }
      }
      */
    };
    settings = $.extend(settings, options || {});
    if (settings.css.lastIndexOf(".", 0) !== 0) //doesn't start with '.'
      settings.css = "." + settings.css;

    var t = settings.t;

    //public methods
    this.lang = function(l) {
      if (l) {
        settings.lang = l;
        this.translate(settings); //translate everything
      }
      return settings.lang;
    };


    this.get = function(index) {
      var res = index;

      try {
        res = t[index][settings.lang];
      } catch (err) {
        //not found, return index
        return index;
      }

      if (res)
        return res;
      else
        return index;
    };

    this.g = this.get;

    //main
    this.find(settings.css).each(function(i) {
      var $this = $(this);

      var trn_key = $this.attr("data-trn-key");
      if (!trn_key) {
        trn_key = $this.html();
        $this.attr("data-trn-key", trn_key); //store key for next time
      }

      $this.html(that.get(trn_key));
    });

    return this;
  };
})(jQuery);