Keep guest services off PBS hosts, refuse only known PBS in PVE scripts and follow the menu conventions

- On a PBS host the Monitor no longer starts the node metrics and VM prewarmers, the LXC update scheduler, the managed installs detector or the app update emitter, which read guests and PVE metrics that do not exist there
- pmx_require_pve refuses only a host known to be PBS, so an unreadable package list leaves the PVE scripts working as before
- The PBS menu numbers its options, shows the tables proxmox-backup-manager prints instead of raw JSON, and says Goodbye on exit
- The PBS update asks to press Enter before returning
- Spanish: Datastores de PBS

lang/es.json

@@ -8132,7 +8132,7 @@
   "Apply PBS package upgrade": "Aplicar la actualización de paquetes de PBS",
   "Apply the reviewed package upgrade now? Services may restart and packages listed for removal will be removed.": "¿Aplicar ahora la actualización de paquetes revisada? Los servicios podrían reiniciarse y se eliminarán los paquetes indicados para su eliminación.",
   "Command failed": "El comando ha fallado",
-  "PBS datastores": "Almacenes de datos de PBS",
+  "PBS datastores": "Datastores de PBS",
   "PBS package update": "Actualización de paquetes de PBS",
   "PBS package upgrade completed. Check whether a reboot is required before your next backup window.": "Actualización de paquetes de PBS completada. Comprueba si es necesario reiniciar antes del próximo período de copias de seguridad.",
   "PBS package upgrade failed. Review the APT output before retrying.": "La actualización de paquetes de PBS ha fallado. Revisa la salida de APT antes de volver a intentarlo.",