Dear Ciaran,
I found a problem that I can not solve. Perhaps you have a tip?
I have placed a language switch in the menu by using the menumod method form your tutorial.
It's working fine on desktop but not on smaller devices. It's not showing the switch.
You can see the issue on https://casas-fruta.eu/pt. The last menu-item with the globe icon.
(you also see EN and NL menu-items above the globe but they are there only as an temporary solution)
I will upload 2 screenprints as well.
TIA