public void setLanguageCode(String languageCode) {
        this.languageCode = languageCode;
    }
The language to use when delivering the message. For a complete list of supported languages, see the Amazon Polly
Developer Guide.

@param languageCode
       The language to use when delivering the message. For a complete list of supported languages, see the
       Amazon Polly Developer Guide.
aws-java-sdk-pinpointsmsvoice/src/main/java/com/amazonaws/services/pinpointsmsvoice/model/SSMLMessageType.java