      GET /something/ HTTP/1.1
      Host: example.com
      Accept: application/json; version=1.0
      """
      invalid_version_message = _("Invalid version in \"Accept\" header.")
  
      def determine_version(self, request, *args, **kwargs):
          media_type = _MediaType(request.accepted_media_type)
          version = media_type.params.get(self.version_param, self.default_version)
          version = unicode_http_header(version)
 
</s> remove     invalid_version_message = _("Invalid version in URL path.")
 </s> add     invalid_version_message = _('Invalid version in URL path.') </s> remove     invalid_version_message = _("Invalid version in query parameter.")
 </s> add     invalid_version_message = _('Invalid version in query parameter.') </s> remove     invalid_version_message = _("Invalid version in URL path.")
 </s> add     invalid_version_message = _('Invalid version in URL path.') </s> remove     invalid_version_message = _("Invalid version in hostname.")
 </s> add     invalid_version_message = _('Invalid version in hostname.') </s> remove msgid "Invalid version in 'Accept' header."
 </s> add msgid "Invalid version in \"Accept\" header."
    invalid_version_message = _('Invalid version in "Accept" header.')
      GET /something/ HTTP/1.1
      Host: example.com
      Accept: application/json; version=1.0
      """
    invalid_version_message = _('Invalid version in "Accept" header.')
  
      def determine_version(self, request, *args, **kwargs):
          media_type = _MediaType(request.accepted_media_type)
          version = media_type.params.get(self.version_param, self.default_version)
          version = unicode_http_header(version)
keep keep keep keep replace keep keep keep keep keep
 prefer single quotes in source and double quotes in user visible strings; add some missing full stops to user visible strings 
rest_framework/versioning.py