For some reason, whenever I click on spoiler tags, the hide/show button turns French. Until I click it once, the button reads "Show", as expected. But once I click it, it reads "Masquer" (French for "Hide"). Clicking it again hides the spoiler, but the button then reads "Afficher" (French for "Show"). Repeated clicks toggle between the two French options, and repeated clicking does not change it back to English.
Example to test against:
This is definitely one of the weirder bugs I've seen. It's mostly harmless, and it shouldn't be a high-priority fix, but I think it ought to be fixed eventually. It just seems unprofessional.
BTW, my language is set to "British English", the only available language option. Since we don't even *have* a French language option, it seems even weirder that I'm seeing this. I also tested it with Adblock disabled (I use it to hide elements of the site I do not like, like the chat frame or the header image), but it makes no difference. I also tested in both Firefox and Opera, which should rule out browser-based bugs.