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/de/common.json

@@ -7375,6 +7375,10 @@
     "backTo": "Zurück zu {name}",
     "cameFromTitle": "Monitorknoten hinzufügen?",
     "cameFromBody": "{name} zu den verknüpften Knoten dieses Monitors hinzufügen.",
-    "notNow": "Nicht jetzt"
+    "notNow": "Nicht jetzt",
+    "knownTitle": "Verknüpfte Knoten hinzufügen?",
+    "knownBody": "{name} verknüpft diese Monitore. Wählen Sie aus, welche Sie diesem Monitor hinzufügen möchten.",
+    "addSelected": "Auswahl hinzufügen",
+    "pbsWebInterface": "PBS-Weboberfläche"
   }
 }