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The problem was in /language/it/common.php not in /language/en/common.php. As soon as I removed the code from common.php in it section, captcha start to work again.... mmh
Then you must have done something wrong while adding the code into this file, ranging from wrong copy / paste to poor text editor usage (non utf-8 like wordpad, using notepad++ would work).
Well don't know.... I use ultraedit32 and I used it for both files modification (/language/it/common.php and language/en/common.php). I coulnd't see any typo... but will check further soon. thanks for your help.