[LyX/master] Unify wording for statistics

[Jean-Marc Lasgouttes]

Le 15/09/2022 à 17:06, Jürgen Spitzmüller a écrit :
>>> One character (no blanks)
>>
>> Or 'One character (not a blank)'
> 
> No, it means: We do not count blanks here.

Note that this special case for One is bogus, since for en empty 
document, we show
0 characters (no blank)

For some reason, only "1" is taken into account.

I do not know though what is the right form that is correct for all 
languages. And I have not implemented (yet) the special support for that 
of gettext in our Messages class.

JMarc