you killed my keys :(

[soko1]

I needed to reinstall the wireguard and without warning all the keys were demolished: ( This is bad!
At least about this you need to ask the user additionally. At least remove the -f switch from rm (rm -r /etc/wireguard)

[soko1]

but then you need to change it:

if [[ -e /etc/wireguard/params ]]; then
        source /etc/wireguard/params
        manageMenu
else
        installWireGuard
fi

for example this:

wg > /dev/null 2>&1 && source /etc/wireguard/params && manageMenu || installWireGuard