"This is an unknown address" when sending to one of the co-signers should say "This is a co-signer address"

[marsrobertson]

More truth.

Less stress.

PS: The "less stress" element is real... :) As I was reviewing this issue for correctness of the wording and for a moment I thought "maybe if it is me who is wrong and reported a non issue", luckily the assets arrived, super simple UI / UX improvement to fix.