@Override
        public Translation apply(TranslationsResource translationPb) {
          return Translation.fromPb(translationPb);
        }
Information about a translation. Objects of this class contain the translated text and the source
language's code. The source language's code can be optionally specified by the user or
automatically detected by the Google Translation service.

@see <a href="https://cloud.google.com/translate/v2/translating-text-with-rest">Translating
    Text</a>
java-translate/google-cloud-translate/src/main/java/com/google/cloud/translate/Translation.java