[web-annotation] Issue: (model) missing mechanism to express language preferences in the intendend audience field marked as i18n-review

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

== (model) missing mechanism to express language preferences in the 
intendend audience field ==
Comment on
https://www.w3.org/TR/2016/WD-annotation-model-20160331/#intended-audience
There is no mechanism to express that an annotation is intended for a 
user with a specific (set of) language preference(s). Example 10 in 
section [choice of bodies and 
targets](https://www.w3.org/TR/2016/WD-annotation-model-20160331/#choice-of-bodies-and-targets)
 shows how to represent multiple languages, but there is no 
interaction defined with teh intended audience.

One use case for this is to generate annotations in one language and 
then use (machine) translation to present them to many users in other 
languages. For this use case the intended audience mechanism would be 
very useful, if it would allow to separate user language preferences.

See https://github.com/w3c/web-annotation/issues/211