public static TranslateOption targetLanguage(String targetLanguage) {
      return new TranslateOption(TranslateRpc.Option.TARGET_LANGUAGE, targetLanguage);
    }
Returns an option for setting the target language. If this option is not provided, the value
returned by {@link TranslateOptions#getTargetLanguage()} is used.

@param targetLanguage the target language code
java-translate/google-cloud-translate/src/main/java/com/google/cloud/translate/Translate.java