Add a Personaliztion object

        :param personalizations: Add a Personalization object
        :type personalizations: Personalization
        :param index: The index where to add the Personalization
        :type index: int

def add_personalization(self, personalization, index=0):
        """Add a Personaliztion object

        :param personalizations: Add a Personalization object
        :type personalizations: Personalization
        :param index: The index where to add the Personalization
        :type index: int
        """
        self._personalizations = self._ensure_append(
            personalization, self._personalizations, index)