fix(backup): use complete messages for archives and destinations

AppImage/messages/en/common.json

@@ -3828,6 +3828,7 @@
       "downloadTitle": "Download this backup",
       "emptyAfter": "backups yet.",
       "emptyBefore": "No",
+      "emptyMessage": "No backup archives found.",
       "encrypted": "Encrypted",
       "encryptedTitle": "This backup is encrypted",
       "filesInBackup": "Files in backup",
@@ -3903,6 +3904,7 @@
       "addPbsRepository": "Add PBS repository",
       "appendAuthorizedKeyBefore": "Append the generated public key to",
       "backupsKeptBefore": "Existing backups are kept in",
+      "backupsKeptMessage": "Existing backup archives are not deleted.",
       "borgEncryptionInherited": "Borg encryption is controlled by the repository.",
       "builtIn": "Built-in",
       "builtInDefault": "Built-in default",
@@ -3923,6 +3925,7 @@
       "leavePassphraseBlank": "Leave blank to keep the saved passphrase.",
       "leavePasswordBlank": "Leave blank to keep the saved password.",
       "localAttachHelpBefore": "Use a mounted local path. For USB drives, mount them first in",
+      "localAttachHelpMessage": "Mount USB drives first. Leave blank to use the PVE storage path + /dump (fallback: /var/lib/vz/dump).",
       "localAttachHelpMiddle": "USB drives",
       "localManualPickHelp": "Pick a local path for one-shot backup output.",
       "localPathHelpAfter": "or another mounted path.",