What do I have to do to fix it?
Fwiw, I merely looked at a Spanish resource page and now I'm locked into a Spanish version of the website.
Just go to https://www.logos.com/en. The link back to English is at the bottom right hand corner of every Spanish page.
Scroll to the bottom of the Logos homepage and you will see the words <Privacía Comentarios English> in the right hand corner.
Click on <English> and the interface should switch back to English.
Edit: Mark beat me to it.
Thanks.
