Bug 15589: Changing 'his' to 'their' in OPAC lists

To be more gender neutral

To test:
1) Go to OPAC lists (opac-shelves.pl)
2) Confirm it now says "Allow anyone to remove their own contributed
   entries."

Signed-off-by: Owen Leonard <oleonard@myacpl.org>

Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>

Signed-off-by: Brendan A Gallagher <brendan@bywatersolutions.com>

koha-tmpl/opac-tmpl/bootstrap/en/modules/opac-shelves.tt

@@ -25,7 +25,7 @@
             [% IF shelf and not shelf.allow_delete_own %]<option value="0" selected="selected">Do not allow</option>[% ELSE %]<option value="0">Do not allow</option>[% END %]
             [% IF not shelf or shelf.allow_delete_own %]<option value="1" selected="selected">Allow</option>[% ELSE %]<option value="1">Allow</option>[% END %]
         </select>
-        &nbsp;<span>anyone to remove his own contributed entries.</span>
+        &nbsp;<span>anyone to remove their own contributed entries.</span>
     </li>
     <li>
         <label>&nbsp;</label>