Updates resource files. (#533)

* repaired

* updated

* refined message handler

Author: bowring

squidCore/src/main/java/org/cirdles/squid/dialogs/SquidMessageDialog.java

@@ -43,7 +43,7 @@ public SquidMessageDialog(Alert.AlertType alertType, String message, String head
         super(alertType);
         initOwner(owner);
         setTitle("Squid3 Alert");
-        setContentText(message);
+        setContentText((message == null) ? "Unknown error ..." : message);
         setHeaderText(headerText);
         initStyle(StageStyle.DECORATED);
         int countOfNewLines = 1;