Acceptance tests were not working as they wasn't adapted to the Angular
framework after the migration. This commit fixes these test that now
work again.

Angular version has been upgraded to 8.2. In addition, "npm audit fix"
has been run to fix any security issue.

A bug was causing the "Limpiar" button of the people view not to work,
as the event-managing method was calling itself. This bugfix solves this
problem by changing the method called by the event-managing method.

The example done for JavaScript, were people can be managed, has been
migrated to Angular.