Normalise language maps

[]

-

[
  {
    "@context": {
      "@language": "en",
      "@vocab": "http://example.com/one#",
      "foo": { "@container": "@language" }
    },
    "foo": "Hello"
  },
  {
    "@context": {
      "@vocab": "http://example.com/two#",
      "foo": { "@container": "@language" }
    },
    "foo": "Hello"
  },
  {
    "@context": {
      "@vocab": "http://example.com/three#",
      "foo": { "@container": "@language" }
    },
    "foo": {
      "en": "Hello"
    }
  },
  {
    "@context": {
      "@language": "de",
      "@vocab": "http://example.com/four#",
      "foo": { "@container": "@language" }
    },
    "foo": {
      "en": "Hello"
    }
  }
]

[
  {
    "http://example.com/one#foo": {
      "en": "Hello"
    }
  },
  {
    "http://example.com/two#foo": {
      "": "Hello"
    }
  },
  {
    "http://example.com/three#foo": {
      "en": "Hello"
    }
  },
  {
    "http://example.com/four#foo": {
      "en": "Hello"
    }
  }
]