I think this needs to be a bit clearer:

In pinentry-tty.c:confirm, only the "ok" button's text is shown and it is
suffixed by a fixed string: "[y/N]", which should be internationalized.

That would require to send this string to all pinentries.

I've revamped pinentry-tty. Instead of displaying y/n, it now uses the first
accelerator or, if there are none, the first alpha numeric character for each
button.