allGauGANLabels.user.js

// ==UserScript==
// @name     All GauGAN Labels
// @version  1
// @grant    none
// @include  http://34.216.122.111/gaugan/
// ==/UserScript==

function selectCategoryAll()
{
  var palette = document.getElementById('palette');
  palette.innerHTML = '<table><tbody></tbody><table>';
  palette = palette.querySelector('tbody');
  [].forEach.call(unsafeWindow.labels, function(lbl) {
    var tr = document.createElement('tr');
    var th = document.createElement('th');
    var button = document.createElement('button');
    button.classList.add('btnclr');
    button.classList.add(lbl);
    button.innerText = lbl[4].toUpperCase() + lbl.slice(5);
    button.onclick = function() {
      unsafeWindow.current_color = unsafeWindow.colors[unsafeWindow.labels.indexOf(lbl)];
    };
    th.appendChild(button);
    tr.appendChild(th);
    palette.appendChild(tr);
  });
}

window.addEventListener('load', function() {
  var pstyle = document.getElementById('palette').style;
  pstyle.maxHeight = '360px';
  pstyle.overflowY = 'scroll';
  
  var categoryList = document.querySelector('#category tr').parentNode;
  var tr = document.createElement('tr');
  var th = document.createElement('th');
  var button = document.createElement('button');
  button.classList.add('btncat');
  button.classList.add('cat-all');
  button.innerText = 'All';
  button.onclick = selectCategoryAll;
  th.appendChild(button);
  tr.appendChild(th);
  categoryList.appendChild(tr);
});