Appcontroller

<?php

App::uses('Controller', 'Controller');
App::import('I18n', 'l10n');

class AppController extends Controller {

    public $helpers = array('Html', 'Form');

    public function getLanguage() {

        return Configure::read('Config.language');

    }

    public function _setFrench() {

        Configure::write('Config.language', "fra");

        $this -> Session -> write('Config.language', 'fra');

        $this -> set('lang', $this -> getLanguage());

    }

    public function beforeFilter() {

        $this -> L10n = new L10n();

        $this -> L10n -> languagePath = array('fra');
        $this -> L10n -> locale = 'fra';

        $setting = $this -> L10n -> get("fra");
        $this -> L10n -> get();

        $this -> set('domain', 'default');


        Configure::write('Config.language', "fra");

        $this -> Session -> write('Config.language', 'fra');


        $this -> set('lang', $this -> getLanguage());

    }

}