I am happily using LEXVO for a HR data set. Thanks for providing it!
The dump though has an error: You are defining the rdfs:labels with xml:lang and rdf:datatype:
<rdfs:label xml:lang="de" rdf:datatype="xsd:string">Ghotuo</rdfs:label>
Please use only xml:lang.
If importing into a triple store, the language info might get lost and only the info that it is a string is kept (happened for Dydra).
Oh, and rdf:datatype accepts only full URIs, so you can't use xsd:string there anyway, but you'd have to use http://www.w3.org/2001/XMLSchema#string .
(But as Anja says, in this case the right thing to do is drop the rdf:datatype attribute completely.)
Thanks a lot for pointing this out! A new RDF dump is available  that
fixes this as well as the issue mentioned by Richard.
Gerard de Melo