'``released_languages`` as a list of language codes.
Example: [\'it\', \'de-at\', \'es\', \'pt-br\']'

@property
def released_languages_list(self):

    if (not self.released_languages.strip()):
        return []
    languages = [lang.lower().strip() for lang in self.released_languages.split(',')]
    languages.sort()
    return languages
