Localize Request Formview

First time here. I hope I’m not wrong here but there is this message that shows in my form view that I couldn’t figure it out how to localize. The massage shows every time I try to add a new data thought my form and that data that happens to be the KEY already exist.

The app is acting the way it should because I don’t want the user to add duplicate data. the problem is just the message that I cant translate to another language.

Should I do this in some other way or this is something that could be added to the Localize settings?