def best_match_language(self):
"""Determines best available locale from the Accept-Language header.
:returns: the best language match or None if the 'Accept-Language'
header was not available in the request.
"""
if not self.accept_language:
return None
all_languages = oslo_i18n.get_available_languages('bilean')
return self.accept_language.best_match(all_languages)
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