protected function isLocaleAvailableAsFallback()
    {
        $currentContentObjectLocale = eZINI::instance()->variable( 'RegionalSettings', 'ContentObjectLocale' );
        $saIni = $this->getSiteAccessIni();
        $siteLanguageList = $saIni->variable( 'RegionalSettings', 'SiteLanguageList' );
        return in_array( $currentContentObjectLocale, $siteLanguageList, true );
    }