@Marhor
This is a reply to the initial post of Marhor.
I found the location of the text in the newcommentscreen :
//ROOT/modules/productcomments/controllers/front/default.php (around line 78)
These texts are not reflected in the admin translations of Prestashop. I haven't figured out how to achieve this but since my shop is only in one language, I have made a change of the text in the page itself (click link for image).
If anybody knows the code to have the translation reflected in the backoffice, please reply.
For now, maybe this helps you a litttle.
Regards,
Yoni
ps. using 1.5.3
http://www.screencast.com/t/vyG56KBld