bug#69995: Untranslatable string

[Göran Uddeborg]

While translating the new version of coreutils to Swedish, I came
across this code from the end of chown-core.h:

  printf (_("\
      --from=CURRENT_OWNER:CURRENT_GROUP\n\
                         change the %sgroup of each file only if\n\
                         its current owner and/or group match those specified\n\
                         here.  Either may be omitted, in which case a match\n\
                         is not required for the omitted attribute\n\
"), user ? "owner and/or " : "");

As this stands, the part "owner and/or " will not be translated.

Simply marking that part too for translation is not a good solution, even
if it would happen to work for Swedish. See
https://www.gnu.org/savannah-checkouts/gnu/gettext/manual/gettext.html#Entire-sentences