Add missing split description (re: #7990)

data/core.yaml

@@ -458,6 +458,7 @@ en:
             multiple_node: Divide the edges of these areas at these points.
         feature:
           multiple:
+            single_node: Divide these features at this point.
             multiple_node: Divide these features at these points.
       key: X
       annotation:

dist/locales/en.json

@@ -612,6 +612,7 @@
                     },
                     "feature": {
                         "multiple": {
+                            "single_node": "Divide these features at this point.",
                             "multiple_node": "Divide these features at these points."
                         }
                     }