docs: public TranslationRequest addCode(String theSystem, String theCode) {
  		Validate.notBlank(theSystem, "theSystem must not be null");
  		Validate.notBlank(theCode, "theCode must not be null");
  		if (getCodeableConcept() == null) {
  			setCodeableConcept(new CodeableConcept());
  		}
  		getCodeableConcept().addCoding(new Coding().setSystem(theSystem).setCode(theCode));
  		return this;
  	}