readme.md

see https://github.com/dolpen/userjs-injector or paste to your user.js

goalstart.user.js

[].slice.call(
  document.querySelector('.tweeting-text').childNodes
).filter(function(n){
  return n.nodeType === 3 && n.nodeValue.trim().length > 3;
}).forEach(function(n){
  n.nodeValue = '反省文を送信する';
});