private void switchMode_Click(object sender, EventArgs e)
{
if (buttonMode == ButtonMode.Numbers)
{
buttonMode = ButtonMode.Ukraine;
}
else if (buttonMode == ButtonMode.Ukraine)
{
buttonMode = ButtonMode.English;
}
else
{
buttonMode = ButtonMode.Numbers;
}
stringHandler.AbortThread();
(sender as Button).Text = buttonMode.ToString();
}