Allow the prefix for where to find message translations to be set.

git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@4466 542714f4-19e9-0310-aa3c-eee0fc999fb1

src/java/com/threerings/util/MessageManager.java

@@ -105,6 +105,15 @@ public class MessageManager
         _cache.clear();
     }
 
+    /**
+     * Sets the appropriate resource prefix for where to find subsequent
+     *  message bundles.
+     */
+    public void setPrefix (String resourcePrefix)
+    {
+        _prefix = resourcePrefix;
+    }
+
     /**
      * Allows a custom classloader to be configured for locating
      * translation resources.