text: Title: write error when adding user avatar or webite
  Body: otherwise running perfectly on pythonanywhere without celery. 
  It might be a wtform validation issue? Getting this error:
  
  `Traceback (most recent call last):
    File "/usr/lib/python3.5/site-packages/flask/app.py", line 2292, in wsgi_app
      response = self.full_dispatch_request()
  
    File "/usr/lib/python3.5/site-packages/flask/app.py", line 1815, in full_dispatch_request
      rv = self.handle_user_exception(e)
    File "/usr/lib/python3.5/site-packages/flask/app.py", line 1718, in handle_user_exception
      reraise(exc_type, exc_value, tb)
    File "/usr/lib/python3.5/site-packages/flask/_compat.py", line 35, in reraise
      raise value
    File "/usr/lib/python3.5/site-packages/flask/app.py", line 1813, in full_dispatch_request
      rv = self.dispatch_request()
    File "/usr/lib/python3.5/site-packages/flask/app.py", line 1799, in dispatch_request
      return self.view_functions[rule.endpoint](**req.view_args)
    File "/usr/lib/python3.5/site-packages/flask_login/utils.py", line 261, in decorated_view
      return func(*args, **kwargs)
    File "/usr/lib/python3.5/site-packages/flask/views.py", line 88, in view
      return self.dispatch_request(*args, **kwargs)
    File "/usr/lib/python3.5/site-packages/flask/views.py", line 158, in dispatch_request
      return meth(*args, **kwargs)
    File "/home/mimesis/flaskbb/flaskbb/user/views.py", line 155, in post
      if self.form.validate_on_submit():
    File "/usr/lib/python3.5/site-packages/flask_wtf/form.py", line 101, in validate_on_submit
      return self.is_submitted() and self.validate()
    File "/usr/lib/python3.5/site-packages/wtforms/form.py", line 310, in validate
      return super(Form, self).validate(extra)
    File "/usr/lib/python3.5/site-packages/wtforms/form.py", line 152, in validate
      if not field.validate(self, extra):
    File "/usr/lib/python3.5/site-packages/wtforms/fields/core.py", line 206, in validate
      stop_validation = self._run_validation_chain(form, chain)
    File "/usr/lib/python3.5/site-packages/wtforms/fields/core.py", line 226, in _run_validation_chain
      validator(form, self)
    File "/usr/lib/python3.5/site-packages/wtforms/validators.py", line 432, in __call__
      message = field.gettext('Invalid URL.')
    File "/usr/lib/python3.5/site-packages/wtforms/fields/core.py", line 166, in gettext
      return self._translations.gettext(string)
    File "/usr/lib/python3.5/site-packages/flask_wtf/i18n.py", line 48, in gettext
      t = _get_translations()
    File "/usr/lib/python3.5/site-packages/flask_wtf/i18n.py", line 40, in _get_translations
      dirname, [get_locale()], domain='wtforms'
    File "/usr/lib/python3.5/site-packages/flask_babel/__init__.py", line 254, in get_locale
      if babel.locale_selector_func is None:
  AttributeError: '_BabelState' object has no attribute 'locale_selector_func'`