// Fix smarty cache after modules translation update

classes/Language.php

@@ -801,6 +801,8 @@ class LanguageCore extends ObjectModel
 			$files_list = $gz->listContent();
 			if (!$gz->extract(_PS_TRANSLATIONS_DIR_.'../', false))
 				$errors[] = Tools::displayError('Cannot decompress the translation file for the following language: ').(string)$iso;
+			// Clear smarty modules cache
+			Tools::clearCache();
 			if (!Language::checkAndAddLanguage((string)$iso, $lang_pack, false, $params))
 				$errors[] = Tools::displayError('An error occurred while creating the language: ').(string)$iso;
 			else

classes/Tools.php

@@ -2117,7 +2117,7 @@ exit;
 	 *
 	 * @param Smarty $smarty
 	 */
-	public static function clearCache($smarty, $tpl = false, $cache_id = null, $compile_id = null)
+	public static function clearCache($smarty = null, $tpl = false, $cache_id = null, $compile_id = null)
 	{
 		if (is_null($smarty))
 			$smarty = Context::getContext()->smarty;