I've been having an issue for the past couple months. Every couple weeks or so, I'll load up the forums in my browser and the righthand pane (with the green "Play" button and account options) will display in Spanish, and most recently German.
The language issue usually resets to English after a day or so. I haven't been able to find a rhyme or reason to the how or why––behind either the language changing to Spanish (or German), or switching back to English.
Has anyone experienced something similar and have an answer?