Follow-up to r1506966:

* subversion/svnadmin/svnadmin.c
  (repos_notify_handler): Don't use the length of an English string when
    printing a localized string.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1511603 13f79535-47bb-0310-9956-ffa450edef68