let the ':lang()' pseudo resolver inherit from the document in case it is not defined on the element itself, solves inconsistent results and passes CSS3 Selectors tests
let the ':lang()' pseudo resolver inherit from the document in case it is not defined on the element itself, solves inconsistent results and passes CSS3 Selectors tests

dperini/nwmatcher,dperini/nwmatcher,dperini/nwmatcher