How to use locale from DB for i18n

help
1

I want to apply internationalisation for my Meteor app, so I use i18n package.
Firstly, when go to my app, user is not logged in so the language is defined by browser language.
After logging in, how can I set the app language based on the property stored at user.profile.displayLanguage in database?
Thanks.

getUserLanguage = function() {
  //use English by default, otherwise use user settings
  var user = Meteor.user();
  if(user && user.profile && user.profile.displayLanguage) {
    return user.profile.displayLanguage;
  }
  return "en";
};

if (Meteor.isClient) {
  Meteor.startup(function() {
    Session.set("showLoadingIndicator", true);

    TAPi18n.setLanguage(getUserLanguage())
      .done(function() {
        Session.set("showLoadingIndicator", false);
      })
      .fail(function(error_message) {
        // Handle the situation
        console.log(error_message);
      });
  });
}
2

I don’t know if this is a good way but at least it works

var displayLanguage = function() {
  if (Meteor.user()) {
    var user = Meteor.user();
    if (user.profile && user.profile.displayLanguage)
      TAPi18n.setLanguage(user.profile.displayLanguage);
    else
      TAPi18n.setLanguage('en');
  } else {
    TAPi18n.setLanguage('en');
  }
  this.next();
}

Router.onBeforeAction(displayLanguage);