GSMaintenance: Put your site in "Maintenance mode"

[vanfruniken]

Hi,
I found an error in all four of the language files, causing the checkbox message not to expand. (it shows '{GSMaintenance/CHECKBOX}' instead).
There is an extraneous trailing colon (','), and that's a syntax error.

You may also want to delete the '?>' at the end. Many web developers do this with php includes because any extra characters after the '?>' could cause unintentional html output.