Add left/center/right alignment to block advanced settings

This is a question that has come up so many times. While bootstrap does provide CSS classes to do this, editors do not usually understand CSS and are confused on how to change alignment.

Therefore I am proposing we add a radio button to advanced settings to toggle the alignment. It would simply add a CSS class to the respective element. Default should be "default" which would not apply any class.

Would appreciate feedback from others about this issue. Once again, the line between content and design is really hard to define, we're mostly playing it by ear based on feedback we get from developers and editors on what things frustrate them or would make their life easier.

Comienza localizando el punto de entrada de advanced-settings del bloque y la gestión existente de las clases de Bootstrap. Confirma cómo debería representar el estado predeterminado un control de radio para izquierda/centro/derecha y aplicar la alineación al elemento correspondiente. Se considera terminado cuando los editores pueden seleccionar cada alineación, mientras que la opción predeterminada no añade ninguna clase.

Escrito por el modelo de indexación a partir del texto del issue.