Add one new variable pass, and in the query one field password.
Add new class ConfirmPasswordUI. Ask to confirm password, if true enable
text fields else error message.
On button "Αλλαγή Στοιχείων" display ConfirmPasswordUI.
Delete class ConfirmPasswordUI now the verifying it's done with
JOptionInputDialog.
Corrected spelling on OptionPane.showInputDialog from "Χρήση" το
"Χρήστη".
Make button "Αλλαγη Στοιχειων" setVisible(false) when password is
correct
Fix spelling on yesNoConfirmDialog();
Fix paths of he libs