Am 27.02.2017 um 17:01 schrieb James Hare:
One option is to allow users to define their own ranked preferences for language beyond just first place. (I personally would enjoy having French as a fallback to English.)
That would badly fragment the parser cache. I don't think it's viable.
This has the downside of only really working for people with accounts, which I suspect might be a minority of overall traffic.
Currently, we only support English for anon visiors (yes, this is very sad; the reason is, again, caching - varnish, this time).