Surprise! Not everyone on HN is in webdev. I don't know much about how this all works but surveyed my user-agent-switcher utility and found no such language options.
It's actually controlled by the Languages setting in your browser. Both Chrome and Firefox let you set the list of languages sent in the header, along with the order.
Doesn't exactly do a lot of good. Sites tend to ignore it, at least from what I've seen.
The first thing I do on any new installation is peruse the settings and tweak to my liking. It seems I missed that option, being privileged to have English as a mother tongue.
Doesn't exactly do a lot of good. Sites tend to ignore it, at least from what I've seen.