BuddyPress.org

Hi,
I am trying to install Spanish language on my site

Homepage

Spanish is already installed and working on the site
I have installed .po and .mo files, and also in place are json files installed by Polylang.
However, when in Buddypress users only get pages in English.

I have been through all documentation I can find (which seems all to be quite old tbh) but have not found any appropriate suggestions/solutions.

Please advise