Function renew_line 

fn renew_line(step: GnupgStep, touch: Touch, tr: &Translator) -> String

What the setup says while GnuPG renews the key: its pinentry open, the PIN typed there (then a touch, when the key may ask for one); the key’s turn, to touch it now and hold the finger a second or two, as long as GnuPG works (Touch::words); else that GnuPG renews it.