Language support for FuelPHP

bootstrap.php

/**
 * app/bootstrap.php
 */
Autoloader::add_classes(array(
    // Add classes you want to override here
    // Example: 'View' => APPPATH.'classes/view.php',
    'Uri' => APPPATH.'classes/uri.php',
    'LayoutHelper' => APPPATH.'classes/layouthelper.php',
));

config.php

/**
 * Localization & internationalization settings
 *
 * app/config/config.php
 */
'language'           => 'en', // Default language
'language_fallback'  => 'en', // Fallback language when file isn't available for default language
'locale'             => 'en_US', // PHP set_locale() setting, null to not set
'locales'            => array(
    'en' => 'en_US',
    'ro' => 'ro_MD',
    'ru' => 'ru_RU',
),

layouthelper.php

<?php

/** 
 * app/classes/layouthelper.php
 */
class LayoutHelper
{
   public static function url($uri = '', $params = array())
   {
       $lang = Config::get('language');

       if ( ! empty($uri))
       {
           $lang .= '/';
       }

       if ($new_uri = Router::get($uri, $params))
       {
           $uri = $new_uri;
       }

       return Uri::create($lang.$uri);
   }
}

routes.php

<?php
/**
 * app/config/routes.php
 */
return array(
    '_root_' => 'welcome/index', // The default route
    '_404_' => 'welcome/404', // The main 404 route

   'history' => 'welcome/history',
);

template.php

/**
 * app/views/template.php
 */
<a href="<?php LayoutHelper::url('/history'); ?>"><?php echo Lang::get('history'); ?></a>

uri.php

<?php

/** 
 * app/classes/uri.php
 */
class Uri extends Fuel\Core\Uri
{
    public function __construct($uri = NULL)
    {
        parent::__construct($uri);
        $this->detect_language();
    }

    public function detect_language()
    {
        if ( ! count($this->segments))
        {
            return false;
        }

        $first = $this->segments[0];
        $locales = Config::get('locales');

        if(array_key_exists($first, $locales))
        {
            array_shift($this->segments);
            $this->uri = implode('/', $this->segments);

            Config::set('language', $first);
            Config::set('locale', $locales[$first]);
        }
    }
}