Language Registrations needed for i-unknown and i-mixed

[John Cowan]

Addison Phillips [wM] scripsit:

> In other words, the UND tag really should not be used (since it adds no real
> information anyway), as François suggests.

However, if the _de facto_ default value is en, then und at least signals
that en is not correct.

-- 
All Gaul is divided into three parts: the part          John Cowan
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