Language changing d'not effet error messages?

[ekirbiz]

How can i change this error messages?
Thanks for replies.

[FSGDAG]

The title of the listing is a mandatory field. Why are you trying to create a listing without a title for it?

[ekirbiz]

No i am not trying adding a link without title.
Only if someone sends a link without title or else, will it give English error messages?
Some fields it gives normal language messages but some fields gives English error mesaages.