v2.4.9

• Update form controls readonly style.
  Since readonly is non-editable, must be able to select and the data will be send when form submitted.
  So, it should look like normal form controls but make it more noticable that it is read only by a little gray out the background color.
  Summary: remove not-allowed cursor, lighter gray background.
• Update input range disabled color.
• Fix missing variables.
• Fix alert dialog to listen enter key (close) properly.