In that folder, I have only the subfolders /en-GB and /it-IT
Hi. I don't know if you need help anymore but I have to say, watching you video, that in Sellacious backend your logged as a seller and not as Admin. Only admin can activate or not languages. If you login as admin (if you are the admin of the site) your control panel will give you a function, in the left vertical menù, to change or select the language. Bye