<beansid-landing-page>.
Take the below as an example:
data-language attribute we override the default language, in this case to German (de-de).
The long-code for the language you want your landing page to display in should be used as the value for language. A full list of supported languages and their corresponding long-codes can be found here.
Only copy that is part of the application will be translated into the overridden language. Any copy you have provided for your offer(s) (e.g. Offer Title, T&Cs etc) will remain as you have provided them to us.