Added translation to portuguese (pt)

Extension point to customize the behaviour of inaccessible views.

Add example of 12-hour time to documentation and fix formatting mistake

add varchar to is_text_column_type

It maintain the default behaviour (403 error) and give a way to
enhance this behaviour. E.g. redirect anonymous users to a login page.

Add documentation about enabling CSRF validation

Allow Changing DateTimeField's date-format using form__widget_args

Allow Changing DateTimeField's date-format using form_args

Change bool_formatter() to be backward compatible with bootstrap2

Fixes #543: Import of wtforms _unset_value needs to change to unset_value

Improved consistancy

Lol not really i changed one line, that was distracting :)

Remove case sensitivity for converter column types