How to handle unknown languages?

[bep]

In v1 it was possible to handle "custom languages" by registering a new plural spec based on the english one.

In v2, the language handling is a little bit more unclear (hidden).

If I try to parse a language file with the name klingon.toml:

m, err := bundle.ParseMessageFileBytes([]byte("[hello]\nother = \"nuqneH\""), "klingon.toml")

I get a Message with language.Undefined in return. This sounds like an error to me, but my main challenge here is: How do I define a new language? I have tried to read up on how golang.org/x/text/language works, but I cannot find a way to register a new language.

See gohugoio/hugo#5242

[nicksnyder]

I agree that this should be supported; just need to figure out how to make it work in conjunction with x/text

[nicksnyder]

Use the language tag art-x-klingon on the latest master.