Translate `now` instead of static `"now"` in DateUtil.

Essentials/src/com/earth2me/essentials/utils/DateUtil.java

@@ -149,7 +149,7 @@ public class DateUtil {
             }
         }
         if (sb.length() == 0) {
-            return "now";
+            return tl("now");
         }
         return sb.toString().trim();
     }