Update vocab/properties.json

Co-authored-by: Andrew Davison <andrew.davison@cnrs.fr>

Author: lzehl

vocab/properties.json

@@ -8405,7 +8405,7 @@
     "label": "External definition of name",
     "labelPlural": "External definitions of name",
     "name": "externalDefinitionOfName",
-    "namePlural": "externalDefinitionOfNames",
+    "namePlural": "externalDefinitionsOfName",
     "usedIn": {
       "latest": [
         "https://openminds.om-i.org/types/NumericalProperty",