bug#71411: 30.0.50; Show Unicode names when describing translations

[Eli Zaretskii <eliz@gnu.org>]

> From: Robert Pluim <rpluim@gmail.com>
> Cc: 71411@debbugs.gnu.org
> Date: Mon, 10 Jun 2024 11:03:07 +0200
> 
> >>>>> On Sat, 08 Jun 2024 16:24:08 +0300, Eli Zaretskii <eliz@gnu.org> said:
> 
>     Eli> Are there any other cases of "translated characters", besides "C-x 8"?
>     Eli> If so, please mention one or two more.  If there are no other
>     Eli> examples, I'd remove "such as".
> 
> iso-transl.el is (almost) the only thing that uses
> `key-translation-map' (the other is 'double.el', but thatʼs really
> niche). I can mention the other prefixes.
> 
> -- >8 --
> *** 'C-h k' ('describe-key') shows Unicode name.
> For keybindings which produce single characters via translation (such as
> those using the 'C-x 8' or 'A-' prefix, or 'dead-acute', 'dead-grave',
> etc), 'C-h k' now shows the Unicode name of the produced character in
> addition to the character itself, e.g.
> 
> 'C-h k C-x 8 E' =>
> 
>     € 'EURO SIGN' (translated from C-x 8 E)
> 
> *** 'C-h b' ('describe-bindings') shows Unicode names.
> For keybindings which produce single characters via translation, the
> Unicode names will now be shown in addition to the character itself,
> i.e.
> 
>     A-!			¡	INVERTED EXCLAMATION MARK
>     A-$			¤	CURRENCY SIGN
> 
> and so on.

What about characters produced by input methods?  For example:

  C-u C-\ cyrillic-translit RET
  C-h k z h =>

    ж (translated from h ж) runs the command self-insert-command

(which, btw, uncovers a bug, since "h ж" is bogus and should be "z h"
instead).