D3 text resize

HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3plus/1.8.0/d3plus.min.js"></script>

CSS

body {
  text-align: center;
}

svg {
  margin-top: 32px;
  border: 1px solid #aaa;
}

.person rect {
  fill: #fff;
  stroke: steelblue;
  stroke-width: 1px;
}

.person {
  font: 14px sans-serif;
}

.link {
  fill: none;
  stroke: #ccc;
  stroke-width: 1.5px;
}

JavaScript

var json = {
  "name": "Maude Charlotte Licia  Fernandez Maude Charlotte Licia  Fernandez Maude Charlotte Licia  Fernandez Maude Charlotte Licia  Fernandez Maude Charlotte Licia  Fernandez Maude Charlotte Licia  Fernandez Maude Charlotte Licia  Fernandez Maude Charlotte Licia  Fernandez Maude Charlotte Licia  Fernandez Maude Charlotte Licia  Fernandez Maude Charlotte Licia  Fernandez Maude Charlotte Licia  FernandezMaude Charlotte Licia  Fernandez Maude Charlotte Licia  Fernandez Maude Charlotte Licia  Fernandez Maude Charlotte Licia  Fernandez",
  "id": "06ada7cd-3078-54bc-bb87-72e9d6f38abf",
  "_parents": [
    {
      "name": "Janie Clayton Norton",
      "id": "a39bfa73-6617-5e8e-9470-d26b68787e52",
      "_parents": [
        {
          "name": "Pearl Cannon",
          "id": "fc956046-a5c3-502f-b853-d669804d428f",
          "_parents": [
            {
              "name": "Augusta Miller",
              "id": "fa5b0c07-9000-5475-a90e-b76af7693a57"
            },
            {
              "name": "Clayton Welch",
              "id": "3194517d-1151-502e-a3b6-d1ae8234c647"
            }
          ]
        },
        {
          "name": "Nell Morton",
          "id": "06c7b0cb-cd21-53be-81bd-9b088af96904",
          "_parents": [
            {
              "name": "Lelia Alexa Hernandez",
              "id": "667d2bb6-c26e-5881-9bdc-7ac9805f96c2"
            },
            {
              "name": "Randy Welch",
              "id": "104039bb-d353-54a9-a4f2-09fda08b58bb"
            }
          ]
        }
      ]
    },
    {
      "name": "Helen Donald Alvarado",
      "id": "522266d2-f01a-5ec0-9977-622e4cb054c0",
      "_parents": [
        {
          "name": "Gussie Glover",
          "id": "da430aa2-f438-51ed-ae47-2d9f76f8d831",
          "_parents": [
            {
              "name": "Mina Freeman",
              "id": "d384197e-2e1e-5fb2-987b-d90a5cdc3c15"
            },
            {
              "name": "Charlotte Ahelandro Martin",
          ...