Fix for RDF error introduced in 60933a56
Created by: gneissone
Return missing period to its rightful home. Simply add back in a period that was mistakenly removed as part of https://github.com/vivo-project/VIVO-languages/pull/76/files#diff-fbfd4b2177c3dae0bbeb4a6d52a553a01120d3313d2959403a78ad58d5d98369L4393