[ffwizard] freiunk-berlin/firmware#30 Remove defaults from wizard

in commit freiunk-berlin/packages-berlin@23d0fb3c21969a283f04e23febfdb60133e690fd
i missed a dot in wizarddefaults
[ffwizard] update texts

adjust help texts to inform user about how to get a new ip
see also freifunk-berlin/firmware#16 and freifunk-berlin/firmware#8