'Returns the list of severity levels that you can assign to an
AWS Support case. The severity level for a case is also a
field in the CaseDetails data type included in any CreateCase
request.
:type language: string
:param language: The ISO 639-1 code for the language in which AWS
provides support. AWS Support currently supports English ("en") and
Japanese ("ja"). Language parameters must be passed explicitly for
operations that take them.'

def describe_severity_levels(self, language=None):

    params = {}
    if (language is not None):
        params['language'] = language
    return self.make_request(action='DescribeSeverityLevels', body=json.dumps(params))
