[ Branched ] Forum language switches from English to Spanish - cannot reset it

Possibly related to this update, i.e. this started happening when I first logged in  yesterday morning (10th March), but whenever I login in order to post, everything switches to Spanish from English (i.e. everything is normal until I have to login to post). Mr Google Translate does a fair job and translates the main discussions page, but when I then open an individual thread all the UI elements switch to Spanish (as you can see from this screenshot taken while typing this response).  All email notifications I receive are also now in Spanish.

This happens in all the forums that I tend to monitor (LrC, Lightroom, LrMobile), it happens with different browsers and it happens on different computers. I assume somehow a language preference has been set for my profile, but I cannot see it in order to reset it. I'd be very grateful if someone could investigate and fix it. Thanks.

[ branched from 3/9/2021 Community Release Notes to Using the Community forum by moderator ]

[ title changed by moderator ]