correct typo unvalid

src/src/eigenpsf/stack/PopupMenu.java

@@ -14,7 +14,7 @@ public class PopupMenu extends JPopupMenu implements ActionListener {
 	//private JMenuItem show = new JMenuItem("Show");
 
 	//private JMenuItem measure = new JMenuItem("Measure");
-	private JMenuItem unselect = new JMenuItem("Mark as unvalid");
+	private JMenuItem unselect = new JMenuItem("Mark as invalid");
 	private JMenuItem select = new JMenuItem("Mark as valid");
 	private Project project;
 	private PatchesTable table;