Upload Source Strings

{
  "data": {
    "type": "resource_strings_async_uploads",
    "attributes": {
      "content": "msgid \"\"\nmsgstr \"\"\n\"Content-Type: text/plain; charset=UTF-8\\n\"\n\nmsgid \"Hello, World!\"\nmsgstr \"\"\n",
      "content_encoding": "text"
    },
    "relationships": {
      "resource": {
        "data": {
          "type": "resources",
          "id": "o:mycompany:p:my-app:r:messages"
        }
      }
    }
  }
}