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class FieldRequiredMessageFormMixin(object):

    def __init__(self, *args, **kwargs):
        super(FieldRequiredMessageFormMixin, self).__init__(*args, **kwargs)
        for field in self.fields.values():
            field.error_messages = {'required': u'Pole {fieldname} jest wymagane.'.format(
                fieldname=field.label
            )}