Misago/misago/emberapp/app/routes/application.js

import Ember from 'ember';

export default Ember.Route.extend({
  actions: {
    error: function(error){
      if (error.status === 0) {
        this.send('setTitle', gettext('Connection lost'));
        return this.intermediateTransitionTo('error-0');
      }

      if (error.status === 403) {
        this.send('setTitle', gettext('Page not available'));

        var final_error = {status: 403, message: null};
        if (error.responseJSON.detail !== 'Permission denied') {
          final_error.message = error.responseJSON.detail;
        }

        return this.intermediateTransitionTo('error-403', final_error);
      }

      if (error.status === 404) {
        this.send('setTitle', gettext('Page not found'));
        return this.intermediateTransitionTo('error-404');
      }

      this.send('setTitle', gettext('Error'));
      return true;
    },

    setTitle: function(title) {
      if (typeof title === 'string') {
        title = {title: title};
      }

      var complete_title = title.title;

      if (typeof title.page !== 'undefined') {
        complete_title += ' (' + interpolate(gettext('page %(page)s'), {page:title.page}, true) + ')';
      }

      if (typeof title.parent !== 'undefined') {
        complete_title += ' | ' + title.parent;
      }

      complete_title += ' | ' + this.get('settings.forum_name');

      document.title = complete_title;
      return false;
    }
  }
});