Update: language-subtag-registry still broken

[Stephane Bortzmeyer]

On Tue, Feb 28, 2012 at 12:49:04AM -0500,
 John Cowan <cowan at mercury.ccil.org> wrote 
 a message of 13 lines which said:

> This is why I preferred the ASCII-plus-Unicode-escapes design of the
> previous registry: it couldn't be corrupted this way.

We are in 2012. People should be able to edit UTF-8 without any
problem, and/or to check afterwards that it validates. Well, may be
not Joe User but a professional staff entitled with the management of
Internet registries should.