Follow up to Bug 8585: add missing word to preference

The preference added in this bug is missing the word
'day(s)'. This patch adds it in.

http://bugs.koha-community.org/show_bug.cgi?id=4118
Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Signed-off-by: Paul Poulain <paul.poulain@biblibre.com>

koha-tmpl/intranet-tmpl/prog/en/modules/admin/preferences/circulation.pref

@@ -55,7 +55,7 @@ Circulation:
             - Set the default start date for the Holds to pull list to
             - pref: HoldsToPullStartDate
               class: integer
-            - ago.
+            - day(s) ago.
         -
             - pref: AllowAllMessageDeletion
               choices: