Hi @JoeMayall. The beta you mention is for managing Subscription types only. I think what’s requested here is a way to easily manage the languages of the entire subscription page (same for the Unsubscribe backup page and Subscription update confirmation page). Making sure that the customers will see all subscription pages and its components (page template + subscription types) in ONE common language is not possible today (at least not that I am aware of).
We experience cases, where a contact submits a form on a spanish page, receives an english DOI email (another issue!), than receives a spanish marketing email and - when clicking on manage preferences - gets a page in spanish+english.