[web-annotation] Issue: Defaults for an Annotation Collection marked as i18n-review

r12a has just labeled an issue for 
https://github.com/w3c/web-annotation as "i18n-review":

== Defaults for an Annotation Collection ==
[raised by r12a, not yet discussed by the i18n WG]

5.1 Annotation Collection
https://www.w3.org/TR/2016/WD-annotation-model-20160331/#annotation-collection

I wonder whether Default Language and Default Direction might be 
useful properties to add to the list of properties that describe the 
use of a collection.  I suppose it depends on how language and 
direction information are assigned to individual annotations. If done 
automatically, this may not be so important.  If done by hand, this 
could save a lot of trouble.

Another property might reflect the language(s) of the intended 
audience of the collection (as opposed to the language of the 
annotations themselves) - particularly for collections containing 
multilingual annotation sets.

See https://github.com/w3c/web-annotation/issues/219