* 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/java/src/net/i2p/router/web/CSSHelper.java

@@ -22,4 +22,10 @@ public class CSSHelper extends HelperBase {
         }
         return url;
     }
+
+    /** change default language for the router but don't save it */
+    public void setLang(String lang) {
+        if (lang != null && lang.length() > 0)
+            _context.router().setConfigSetting(Messages.PROP_LANG, lang);
+    }
 }