programs/xcopy: Fix casing of usage message

[Hugh McMaster]

On Wednesday, 18 Nov 2015 19:08:29 -0600, Austin English wrote:
> - STRING_SIMCOPY,  "%1!d! file(s) would be copied\n"
> - STRING_COPY,     "%1!d! file(s) copied\n"
> - STRING_SIMCOPY,  "%1!d! File(s) would be copied\n"
> - STRING_COPY,     "%1!d! File(s) copied\n"

Hi Austin,

You should probably patch all of the po files as well. It's a simple change,
and it means Alexandre doesn't have to regenerate everything.

--
Hugh McMaster