File "C:\Python27\lib\site-packages\wtforms\fields\core.py", line 131, in __html__
return self()

File "C:\Python27\lib\site-packages\wtforms\fields\core.py", line 140, in __call__
return self.widget(self, **kwargs)

File "C:\Python27\lib\site-packages\flask_wtf\recaptcha\widgets.py", line 68, in __call__
'visual_challenge':    _('Get a visual challenge'),

File "C:\Python27\lib\site-packages\flaskext\babel.py", line 456, in gettext
t = get_translations()

File "C:\Python27\lib\site-packages\flaskext\babel.py", line 194, in get_translations
translations = support.Translations.load(dirname, [get_locale()])

File "C:\Python27\lib\site-packages\flaskext\babel.py", line 209, in get_locale
babel = ctx.app.extensions['babel']