replaceSmartQuotes.gs

// There are two ways to run this script
//
// 1. Replace all Smart Quotes in all Docs that are inside of a folder (and all subfolders)
// 2. Replace all Smart Quotes in one particular file
//
// Choose the which one you want to use and then change the value of the appropriate var, then select the method from the menu and press Run.


// Replace Smart Quotes with Dumb Quotes for every Document that is inside of the given folder
function findAndReplaceAll() {
  
  var folder_name = "OMG-PLEASE-CHANGE-ME"
  
  
  var f = DriveApp.getFoldersByName(folder_name);
  var bp_folder = f.next();
  traverseFolder(bp_folder);
}

function findAndReplaceOne() {
  
  var file_name = "OMG PLEASE CHANGE ME OH PLEAAAASEEEE";
  
  
  f = DriveApp.getFilesByName(file_name);
  if (f.hasNext()) {
    file = f.next();
    quoteReplace(file)
  }
}


// This function does the actual find and replace
function quoteReplace(file) {
  Logger.log(file);
  var doc = DocumentApp.openById(file.getId());
  var body = doc.getBody();
  doc.replaceText("‘", "'"); 
  doc.replaceText("’", "'"); 
  doc.replaceText("“", "\""); 
  doc.replaceText("”", "\""); 
  doc.saveAndClose();
}

// This functions traverses all folders recursively
function traverseFolder(folderObj) {
  traverseFiles(folderObj);
  
  var subs = folderObj.getFolders();
  while (subs.hasNext()) {
    traverseFolder(subs.next());
  }
}

// This function traverses all files (GOOGLE DOCS) in a given folder
function traverseFiles(folder) {
  var doc, documents = folder.getFilesByType(MimeType.GOOGLE_DOCS);
  
  while (documents.hasNext()) { 
    var file = documents.next();
    Logger.log(file.getName());
    quoteReplace(file);
  }
}

Thats deep