Get title of route

getTitle(state: RouterState, parent: ActivatedRoute) {
  const data = [];
  if (parent && parent.snapshot.data && parent.snapshot.data.title) {
    data.push(parent.snapshot.data.title);
  }

  if (state && parent) {
    data.push(...this.getTitle(state, parent.firstChild));
  }

  return data;
}