Even though I set my language preference here to English, everything shows in Irish.
Is it just me?
You got it, Visvanath. "New" as in behaving like an "old" machine.
Off the top of my head it should detect the language from what the browser sends in the request's HTTP headers. With your browser's developer tools open (e.g. Network Monitor in Firefox) what does it say in the request's Accept-Language header? I see Accept-Language: en-GB,en;q=0.5:
and British English (en-GB) is the correct language for my set-up.
It happened to me today. My browser sent Accept-Language: en-GB,en;q=0.5 and moodle.org responded content-language: hat (i.e. Haitian Creole). Reported as MDLSITE-6714.
I currently have this language oddity on this site...