[PATCH 2 of 7] notify: make a message translatable

[FUJIWARA Katsunori]

# HG changeset patch
# User FUJIWARA Katsunori <foozy at lares.dti.ne.jp>
# Date 1464195454 -32400
#      Thu May 26 01:57:34 2016 +0900
# Node ID b6c75aa89aa7c51fd324d3201e9e945baafa1250
# Parent  25a9f8af572b602dd44f1a2f59417589ac93f040
notify: make a message translatable

This message has been overlooked by check-code, because it starts with
non-alphabet character ('\').

Making this message translatable seems reasonable, because messages
below in same function are already translatable

  - '\ndiffs (truncated from %d to %d lines):\n\n'
  - '\ndiffs (%d lines):\n\n'

This is also a part of preparation for making "missing _() in ui
message" detection of check-code more exact.

diff --git a/hgext/notify.py b/hgext/notify.py
--- a/hgext/notify.py
+++ b/hgext/notify.py
@@ -363,7 +363,7 @@ class notifier(object):
             s = patch.diffstat(difflines)
             # s may be nil, don't include the header if it is
             if s:
-                self.ui.write('\ndiffstat:\n\n%s' % s)
+                self.ui.write(_('\ndiffstat:\n\n%s') % s)
 
         if maxdiff == 0:
             return