Update the Dict client to match the updated API output format

Sample output:

{
  "source": "cat",
  "freetext": [
    {
      "text": "cat /kæt/\r\n Katze <f>",
      "sources": [
        [
          "fd-eng-deu"
        ]
      ]
    }
  ]
}

Followup: I138b5d457ce46c5bfe4e760d95f29c3adf25abfd
Change-Id: I26eb2d40da268ddbfcb91b01b7c88cbb67fa05ed