public function install()
 {
     $id_lang_en = LanguageCore::getIdByIso('en');
     $id_lang_fr = LanguageCore::getIdByIso('fr');
     $this->installModuleTab('AdminMultifeature', array($id_lang_fr => 'Caractéristiques multiples', $id_lang_en => 'Multi features'), 9);
     $query = 'ALTER TABLE ' . _DB_PREFIX_ . 'feature_product DROP PRIMARY KEY ,
     ADD PRIMARY KEY ( `id_feature` , `id_product` , `id_feature_value` )';
     if (!Db::getInstance()->Execute($query)) {
         return false;
     }
     if (parent::install() == false) {
         return false;
     }
     return true;
 }
 private function installBackOffice()
 {
     $id_lang_en = LanguageCore::getIdByIso('en');
     $id_lang_fr = LanguageCore::getIdByIso('fr');
     $this->installModuleTab('AdminManageexportorder', array($id_lang_fr => 'Export des commandes', $id_lang_en => 'Order export'), 10);
     return true;
 }