Please document how to add custom translations or overwrite the Strings in FirebaseAuthSwiftUI

[JoniGoos]

I want to change the title from "Sign in with Firebase" to something else but I don't find how to do this. I think it is possible but I don't know how. Please document it.

[google-oss-bot]

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[russellwheatley]

Hey @JoniGoos - I've created a PR for this so that single strings can be overridden whilst preserving the default values 👍