NB Implementation: add icons to references tab

Change-Id: If4f4792192871fb1fda6b7ab3cbf2907dffc38fb
Reviewed-on: https://gerrit.libreoffice.org/51879Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: andreas_kainz <kainz.a@gmail.com>

officecfg/registry/data/org/openoffice/Office/UI/WriterCommands.xcu

@@ -1170,6 +1170,9 @@
         <prop oor:name="Label" oor:type="xs:string">
           <value xml:lang="en-US">~Footnotes and Endnotes...</value>
         </prop>
+        <prop oor:name="Properties" oor:type="xs:int">
+          <value>1</value>
+        </prop>
       </node>
       <node oor:name=".uno:CurrentFootnoteDialog" oor:op="replace">
         <prop oor:name="Label" oor:type="xs:string">