feat(frontend): add confirmation dialog before deleting users, peers, and interfaces (#654)

* feat(frontend): add confirmation dialog before deleting users, peers, and interfaces (#652)

Add a browser confirm() dialog to the delete functions in UserEditModal,
PeerEditModal, and InterfaceEditModal to prevent accidental deletions.
The bulk-delete actions in UserView already had this protection; this
change brings single-item deletion in line with that behavior.

Translation keys (confirm-delete) added for all 10 supported locales:
de, en, es, fr, ko, pt, ru, uk, vi, zh.

Signed-off-by: LeC-D <leo.openc@gmail.com>

* fix broken translation files

---------

Signed-off-by: LeC-D <leo.openc@gmail.com>
Co-authored-by: Christoph Haas <christoph.h@sprinternet.at>

frontend/src/components/PeerEditModal.vue

@@ -294,6 +294,7 @@ async function save() {
 
 async function del() {
   if (isDeleting.value) return
+  if (!confirm(t('modals.peer-edit.confirm-delete', {id: selectedPeer.value.Identifier}))) return
   isDeleting.value = true
   try {
     await peers.DeletePeer(selectedPeer.value.Identifier)