code: public final String apply(String input, Language inputLanguage) {
      if (input != null && Config.get(this.getClass(), inputLanguage, "apply").asBoolean(true)) {
        return performNormalization(input, inputLanguage);
      }
      return input;
    }
docs: Performs a pre-processing operation on the input string in the given input language
  
  @param input         The input text
  @param inputLanguage The language of the input
  @return The post-processed text