Hadrien

N3Parser: support escape sequences in local names

1

According to [RDF 1.1 Turtle specification](https://www.w3.org/TR/turtle/#grammar-production-PN_LOCAL), the grammar accepts local names as production node, for ex `foaf:name` This local name can contain escape sequences:  which are enumerated as follows:...

feat: support rdf:LangString datatype (+test)

1

As of current, datatype `rdf:langString` is not supported. If we try to convert the following shex ``` { a [ interop:AccessNeedDescription ] ; interop:inAccessDescriptionSet IRI // shex:reference ; interop:hasAccessNeed IRI...

feat: support xsd:language datatype (+test)

2

This PR is similar to #139 and fixes the same issue with a different data type.