I try but now I have this error :

Warning: require_once(/home/dolphin6/public_html/langs/lang-portu.php) [function.require-once]: failed to open stream: No such file or directory in /home/dolphin6/public_html/inc/languages.inc.php on line 33

Fatal error: require_once() [function.require]: Failed opening required '/home/dolphin6/public_html/langs/lang-portu.php' (include_path='.:/usr/lib/php:/usr/local/lib/php') in /home/dolphin6/public_html/inc/languages.inc.php on line 33

I need to delete see more the lang and create another ?