Language without region considered invalid by $validate operation.

[tadgh]

When a resource is subbmited which has a communication, and it has Prefered Binding to Common languages and Max binding to All languages, it fails with a validation error. Note the following json uses only language nl, instead of the language-region combo nl-DE or nl-NL.

{
  "resourceType": "Patient",
  "id": "f001",
  "communication": [
    {
      "language": {
        "coding": [
          {
            "system": "urn:ietf:bcp:47",
            "code": "nl",
            "display": "Dutch"
          }
        ],
        "text": "Nederlands"
      },
      "preferred": true
    }
  ]
}

This should not fail validation, as nl is a valid bcp47 language tag.