[data-shapes] Add support for directional language-tagged literals (#337)

bergos has just created a new issue for https://github.com/w3c/data-shapes:

== Add support for directional language-tagged literals ==
RDF 1.2 introduced [directional language-tagged literals](https://www.w3.org/TR/rdf12-concepts/#section-Graph-Literal). A constraint component should be added, similar to the datatype and language elements constraints.

Please view or discuss this issue at https://github.com/w3c/data-shapes/issues/337 using your GitHub account


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