pageend: Powerbutton-Alert with static position
pageend: Powerbutton-Alert with static position

- Replaced js position calculation by static positioning of reboot alert
Should address #980

mschlenstedt/Loxberry,mschlenstedt/Loxberry,mschlenstedt/Loxberry,mschlenstedt/Loxberry,mschlenstedt/Loxberry,mschlenstedt/Loxberry