Implement BundleMessage.toString() for direct usage in Log4J logger

git-svn-id: http://svn.code.sf.net/p/davmail/code/trunk@554 3d1905a2-6b24-0410-a738-b14d5a86fcbd

src/java/davmail/BundleMessage.java

@@ -73,6 +73,11 @@ public class BundleMessage {
         return MessageFormat.format(getBundle(locale).getString(key), formattedArguments);
     }
 
+    @Override
+    public String toString() {
+        return formatLog();
+    }
+
     public static String formatLog(String key, Object... arguments) {
         return format(ROOT_LOCALE, key, arguments);
     }