function look_up_language() {


		// Language recognition (STELLA_CURRENT_LANG) for multisite should be in sunrise.php
		if( is_multisite() )
			return;

		$use_lang = $this->langs['default']['prefix'];

		// Language recognition in rewrite_url function. only for subfolder situation
		if( $this->is_subfolder() && is_permalinks_enabled() ){
			$this->set_current_language($use_lang);
			return;
		}

		if ( $this->use_hosts  ):
			foreach ( $this->langs['others'] as $prefix => $lang ) {
				if ( $_SERVER['HTTP_HOST'] == $lang['host'] || $_SERVER['HTTP_HOST'] == 'www.' . $lang['host'] ) {
					$use_lang = $lang['prefix'];
					break;
				}
			}
		elseif ( ! is_permalinks_enabled() ) :
			// Non-permalinks variant.
			if ( isset($_GET['lang']) ) :
				foreach ( $this->langs['others'] as $prefix => $lang ) {
					if ( $_GET['lang'] == $lang['prefix'] ) {
						$use_lang = $lang['prefix'];

						break;
					}
				}
			endif;
		else: // Permalinks no-hosts variant.
			if( ! $this->is_subfolder() ){ //wp is not in subfolder
				$uri = $_SERVER['REQUEST_URI'];
				$code = substr( $uri, 0, 4 );
				if ( '/' != substr( $code, -1 ) )
					$code = $code . '/';

				foreach ( $this->langs['others'] as $prefix => $lang ) {
					if ( ! ( false === strpos( $code, '/' . $lang['prefix'] . '/' ) ) ) {
						$use_lang = $lang['prefix'];
						break;
					}
				}
			}

		endif;

		$this->set_current_language($use_lang);
	}

	/**
	 * Sets the current language
	 * and also the locale
	 * @param string $lang current language
	 */
	private function set_current_language($lang){

		if( ! defined( 'STELLA_CURRENT_LANG' ) ) {
			define('STELLA_CURRENT_LANG', $lang);
		}



		add_filter('locale', array(&$this,'stella_setlocale'), 10);

	}

	/**
	 * locale hook when load_theme_textdomain is present in functions.php
	 *
	 *
	 * called by locale hook
	 */
	public function stella_setlocale( $locale ) {
		//for now we have these
		$locales = array(
			'en' => 'en_US',
			'fr' => 'fr_FR',
			'zh' => 'zh_CN'
		);

		return $locales[STELLA_CURRENT_LANG];
	}