PROPOSAL to close ISSUE-35 per Jose's suggestion

I propose to close ISSUE-35 following Jose's suggestion:

to have a new requirement which could be:

5.12: Language Tags

SHACL must have a mechanism to constrain the language tags of RDF 
literals.

6.4. Complex constraints on Language Tags

Some constraints require comparing language tags of RDF literals, e.g. to 
check that no language is used more than once per property. 

https://www.w3.org/2014/data-shapes/track/issues/35
https://www.w3.org/2014/data-shapes/wiki/Requirements#Expressivity:_Language_Tags
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Arnaud  Le Hors - Senior Technical Staff Member, Open Web Technologies - 
IBM Software Group