How do I change the sign in modal's text/ language from ("bundlename" wants to Use "" to Sign In) to something else?

After launching the login function, an alert shows up that asks the user to give permission to the app, so they can login through Facebook. I have two problems with this, one is that it uses my bundlename which wouldn’t be decent user experience, and two it does not show up in the language set internally within the app. Is there anyway I could configure it? I would like to at least change the bundlename to my application’s name.