fix: clarify system update action and package plan

AppImage/messages/en/common.json

@@ -5470,7 +5470,7 @@
       "failedLogins": "{count} failed login attempts in 24h",
       "fail2banBannedIps": "Fail2Ban is currently blocking {count} IP addresses (jails: {jails})",
       "uptimeDays": "Uptime: {count} days",
-      "pendingPackages": "{count} packages pending",
+      "pendingPackages": "Planned packages: {count} (including new packages)",
       "updatedDaysAgo": "Last updated {count} days ago",
       "startupStoragesChecking": "Checking Proxmox storage after startup: {storages}",
       "startupStorageChecking": "Checking Proxmox storage after startup: {storage}",
@@ -5498,6 +5498,8 @@
     },
     "noIssues": "No issues detected",
     "updateNow": "Update now",
+    "updateSystem": "Update system",
+    "packagePlanNote": "The plan also includes new packages, such as a new kernel. The overview counts updates to existing packages only.",
     "dismissedItems": "Dismissed items ({count})",
     "permanent": "Permanent",
     "dismissed": "Dismissed",