Merge branch 'nd/maint-diffstat-summary'

Earlier we made the diffstat summary line that shows the number of
lines added/deleted localizable, but it was found irritating having
to see them in various languages on a list whose discussion language
is English.

The original had trivial thinko in reverting Q_(), which has been
fixed.

* nd/maint-diffstat-summary:
  Revert diffstat back to English

diff --cc diff.c
Simple merge