Support for BCP 47 (Tags for Identifying Languages)

(This message is cross-posted to both the mozilla.dev.l10n and
mozilla.dev.i18n newsgroups; feel free to use either to respond.)

Hello all,

Axel wanted me to let you know that work is progressing on getting
support for the latest BCP 47 into Firefox.

For starters, the main bug we're working in (though it will likely
become a tracking bug once we get into the nitty gritty) is bug 356038
(alias: bcp47).

https://bugzilla.mozilla.org/show_bug.cgi?id=356038

Kevin Scannell and I have also put together a wiki page to detail
precisely what our plan of action will be.

https://wiki.mozilla.org/User:GPHemsley/BCP_47

Our intent is to fully and properly implement BCP 47 and improve
language preference selection within Firefox, while also limiting the
impact on the l10n and i18n communities.

As such, we encourage you to voice your thoughts and opinions on this
process. None of the steps of the plan of action are set in stone, so
feel free to correct and update the wiki page or discuss controversial
portions here.

You may also ask any questions or raise any issues we haven't thought
of.

Thanks,
Gordon

P.S.
For those wondering:
Kevin has an extensive background in computational linguistics and
natural language processing. He also is very active with translation
and localization into endangered and minority languages, particularly
of the Celtic variety (e.g. Irish, Scottish, and Manx Gaelic).
I just graduated with a Bachelor's degree in general linguistics (with
a particular interest in syntax and endangered and minority
languages), and I plan to pursue further graduate work in linguistics
this fall.