Upgrading Flask-WTF and more

This breaking the functionality, but it's been a while :)
I tried that as well but we need this one: `from flask.ext import wtf` as the actual `wtf.Form` is from there..

From: https://flask-wtf.readthedocs.org/en/latest/quickstart.html#creating-forms

> From version 0.9.0, Flask-WTF will not import anything from wtforms, you need to import fields from wtforms.