Customizable message on the access request

Hello,


We use "user supplied credentials" so we need to fill the fields with username and credentials in order to access to a server. 
The only way for us to access is by inserting domain\username and not simply inserting the username. 
On safeguard by default it says "Username or domain\username", is there a way to customize that message and leave it as "Domain\username"?

Thanks a lot

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