Fix langtag parsing

Julien LepillerWed Apr 01 03:28:17+0200 2020

e4fcd88

guile-rdf/test-modules
namelast commitdate
online.scmAdd test infrastructure and turtle testTue Mar 31 04:36:16+0200 2020
result.scmAdd test infrastructure and turtle testTue Mar 31 04:36:16+0200 2020
testsuite.scmAdd test infrastructure and turtle testTue Mar 31 04:36:16+0200 2020