Added information about uses of i18n in plugin.xml.

git-svn-id: http://svn.igniterealtime.org/svn/repos/wildfire/trunk@7861 b35dd754-fafc-0310-a699-88a17e54d16e

documentation/docs/plugin-dev-guide.html

@@ -341,8 +341,13 @@ procedure:
         <fmt:message key="some.key.name" />
         </pre>
     </li>
-    You can also internationalize Strings in your Java files using the LocaleUtils class:<br>
-    <tt>org.jivesoftware.util.LocaleUtils.getLocalizedString("some.key.name", "[plugin_name]");</tt>
+    <li>Internationalize Strings in your Java files using the LocaleUtils class:<br>
+        <tt>org.jivesoftware.util.LocaleUtils.getLocalizedString("some.key.name", "[plugin_name]");</tt>
+    </li>
+    <li>Internationalize Strings in your plugin.xml file using the ${var} format:<br>
+        <tt>&lt;sidebar id="gateways" name="${plugin.sidebar.name}" description="${plugin.sidebar.description}"&gt;</tt><br>
+        <tt>&lt;description&gt;${plugin.description}&lt;/description&gt;</tt>
+    </li>
 </ul>
 </p>
 <h2>Using the Openfire Build Script</h2>