* Router Console translation infrastructure:

- Persistent lang setting with routerconsole.lang=xx
      - Loading any page with ?lang=xx changes the persistent setting
      - Add a custom Jetty handler to load foo_xx.jsp if it
        exists for language xx. This is for jsp files with lots
        of text in them. Otherwise use inline translate methods.
        Not for included jsps.
      - Add a script to create and update messages_xx.po translation
        files, and create ResourceBundles from them
      - Add class to translate strings from cached ResourceBundles
      - Add translate wrappers to HelperBase, FormHandler, and *Renderer,
        so calls can be made from both jsp and java files
      - Add two example translations on configupdate.jsp - one in
        the jsp itself and one in the helper.
      - This is for strings in routerconsole only. Will be expanded
        to other webapps and the router later.

apps/routerconsole/jsp/index.jsp

@@ -29,5 +29,6 @@ if (System.getProperty("router.consoleNonce") == null) {
  <jsp:setProperty name="contenthelper" property="page" value="<%=fpath.getAbsolutePath()%>" />
  <jsp:setProperty name="contenthelper" property="maxLines" value="300" />
  <jsp:setProperty name="contenthelper" property="lang" value="<%=request.getParameter("lang")%>" />
+ <jsp:setProperty name="contenthelper" property="contextId" value="<%=(String)session.getAttribute("i2p.contextId")%>" />
  <jsp:getProperty name="contenthelper" property="content" />
 </div></body></html>