Fix stop AP button

[amrsoll]

No description provided.

[hungerpirat]

Stop Access Point Button should work properly =>

• it should disable the AP mode permanently.
• if user is connected via AP, button is disabled and showing an explanation why.
• After pressing the button, the user gets information about how to enable it again
  • user gets a hint, that enabling the AP mode is only possible with network reset described below. Additionally we teach him, when a reset might be necessary (different location, different wifi)
  • link to knowledge base article how to reset the network (needs to be adjusted)
  • a network reset stick (reset-stick file download starts, pdf with stick user manual as well)
  • then the AP is disabled

TODOs

• the reset network usb stick script needs to re-enable the AP mode.
• behaviour should be fixed on new and old image