Carry the linked nodes across Monitor jumps and clarify PBS web links

- A jump between Monitors carries the Monitors the source links, and the destination offers them in one dialog with a checkbox each
- The offer is not repeated in the same browser session after choosing Not now, and disappears once every node is known
- A Proxmox Backup Server without a Monitor is shown as its web interface, with its own icon
- The linked nodes form follows the edit-mode contrast rule, with a blue Add button
- New texts translated into all languages

AppImage/messages/it/common.json

@@ -7375,6 +7375,10 @@
     "backTo": "torna a {name}",
     "cameFromTitle": "aggiungi il nodo Monitor?",
     "cameFromBody": "aggiungi {name} ai nodi collegati di questo monitor.",
-    "notNow": "Non ora"
+    "notNow": "Non ora",
+    "knownTitle": "Aggiungere nodi collegati?",
+    "knownBody": "{name} collega questi monitor. Scegli quelli da aggiungere a questo monitor.",
+    "addSelected": "Aggiungi selezionati",
+    "pbsWebInterface": "Interfaccia web di PBS"
   }
 }