function onOpen() {
  var ui = FormApp.getUi();
  ui.createMenu('Scripts')
    .addItem('Replace 4+ spaces with line breaks in Title and Description', 'addLineBreaks')
    .addToUi();
}

function addLineBreaks() {
  var theForm = FormApp.getActiveForm();
  var theQuestions = theForm.getItems();
  var thePlaceholder = new RegExp(/\s{4,99}|\n/, 'gi');
  for (i = 0; i < theQuestions.length; i++) {
    var theText = theQuestions[i].getHelpText();
    if (theText.search(thePlaceholder) > 0 ) {
      theQuestions[i].setHelpText(theText.replace(thePlaceholder,'    \n'));
    }
    theText = theQuestions[i].getTitle();
    if (theText.search(thePlaceholder) > 0 ) {
      theQuestions[i].setTitle(theText.replace(thePlaceholder,'    \n'));
    }
  }
}