old_contents: getUserLanguage = function () {
    // Put here the logic for determining the user language
  
    return "zh";
  };
  
  if (Meteor.isClient) {
    Meteor.startup(function () {
      _.extend(Notifications.defaultOptions, {
        timeout: 3500
      });
  
      TAPi18n.setLanguage(getUserLanguage())
        .done(function () {
          Session.set("showLoadingIndicator", false);
        })
        .fail(function (error_message) {
          // Handle the situation
          console.log(error_message);
        });
    });
  }
new_contents: const userLanguage = () => {
    // If the user is logged in, retrieve their saved language
    if (Meteor.user()) return Meteor.user().profile.language;
  };
  
  if (Meteor.isClient) {
    Meteor.startup(function () {
      _.extend(Notifications.defaultOptions, {
        timeout: 3500
      });
  
      Tracker.autorun(() => {
        let lang;
  
        // URL Language takes priority
        const urlLang = FlowRouter.getQueryParam('lang');
        if (urlLang) {
          lang = urlLang;
        } else if (userLanguage()) {
          // User language is set if no url lang
          lang = userLanguage();
        } else {
          // If no user language, try setting by browser (default en)
          const localeFromBrowser = window.navigator.userLanguage || window.navigator.language;
          let locale = 'en';
  
          if (localeFromBrowser.match(/en/)) locale = 'en';
          if (localeFromBrowser.match(/zh/)) locale = 'zh';
  
          lang = locale;
        }
        TAPi18n.setLanguage(lang);
      });
    });
  }
subject: Add a new method to find language for user