It seems that I am able to replicate it --- at least on Chrome on both my Mac and Android devices --- if I clear cookies. Manually setting the language to English does work, but (as best as I can recall) I also believe the language setting reverts back to Spanish if a significant amount of time passes since my last visit to the website. For example, I only recently started playing again, but I tended to check the website every 2-3 months (#nostalgia), and the website was almost always in Spanish (I don't clear cookies that often, so I don't suspect that would be the cause).
Also, I just attempted to replicate this on Safari and Firefox (on my Mac) and was unable to. I will attempt to replicate on IE and Firefox (Windows) once I'm back at my desktop.
One last thing: I'm noticing at the moment that only part of the page is in Spanish. For example, "continue to website" in the top right and "play now" in the top center and bottom center are in Spanish, while the ac...