Polymer i18n alpha

i18n.js

app.LocalizationBehavior = {
    properties: {
      locale: {
        type: String,
        reflectToAttribute: true
      },
      /*localized: {
        type: Boolean,
        value: false
      },*/
      i18n: {
        type: String,
        reflectedToAttribute: true
      }
    },
    localize: function(callback, path, files, tag, namespace, id) {
      //this.localized = false;
      //this.locale = app.i18n.lang;
      // [].forEach.call(namespaces, function() {
      //
      // });
      var _callback = function(locale) {
        if (this.locale !== locale) {
          this.locale = locale;
          app.i18n.bootstrap(this.getElementsByTagName(tag), namespace);
          app.i18n.setLocale(namespace, locale, id);
        } else {
          return;
        }
        //this.localized = true;
      }.bind(this);
      //namespace + (id !== undefined ? '.' + id : ''),
      app.i18n.attach(_callback);
      //app.i18n.subscribe(_callback);
      app.i18n.load(path, files, namespace, function() {
        if (app.i18n.ready(files) === true) {
          if (callback !== undefined && callback !== null && typeof callback === 'function') {
            callback();
          }
        }
      });
    }
  };