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

[Robert Pluim]

'C-x 8 RET' will show Unicode names when it shows completions, which
helps people find the complete name of the character they want to use.

I have a patch to do something similar for 'C-h k' and 'C-h b' (for
translated keys only), so youʼd get

'C-h k C-x 8 E' =>

    € 'EURO SIGN' (translated from C-x 8 E)

Since the purpose of this is to provide more information by default in
situations where people are searching for answers, I
donʼt think this needs a configuration variable, unlike the analogous
feaure in 'what-cursor-position'. (yes, people can hit 'C-u C-x =' in
the *Help* buffer, but first they have to know about that).

Patch to follow when I have the bug number.

Robert
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