async process(locale, phrase) {
    const sentiment = await this.analyzer.getSentiment(
      phrase,
      locale,
      this.settings
    );
    return this.translate(sentiment);
  }
Process a phrase of a given locale, calculating the sentiment analysis.
@param {String} locale Locale of the phrase.
@param {String} phrase Phrase to calculate the sentiment.
@returns {Promise.Object} Promise sentiment analysis of the phrase.