Add server user/protocol migrate export-import for connect_domain moves.

translations/en.json

@@ -415,6 +415,20 @@
     "server_connect_domain_current":  "Endpoint in configs",
     "server_connect_domain_ssh":  "SSH",
     "server_connect_domain_saved":  "Connection domain saved",
+    "migrate_title":  "Migrate users",
+    "migrate_desc":  "Move clients to a new server with the same domain",
+    "migrate_hint":  "Export keeps users, bindings and protocol state (keys/peers). On the new server: add it with the new IP and the same connect_domain → install the same protocols → import the ZIP → update the DNS A-record. Client configs stay unchanged.",
+    "migrate_export_label":  "Export from this server",
+    "migrate_export_btn":  "Download migration pack (.zip)",
+    "migrate_exporting":  "Building migration pack…",
+    "migrate_export_done":  "Migration pack downloaded",
+    "migrate_import_label":  "Import onto this server",
+    "migrate_import_btn":  "Import migration pack (.zip)",
+    "migrate_import_hint":  "Install the same protocols on this server first. Do not use Move Connections — it regenerates keys.",
+    "migrate_import_confirm":  "Import users and protocol state onto this server? Existing client_id values will be kept.",
+    "migrate_importing":  "Importing migration…",
+    "migrate_import_done":  "Migration imported",
+    "migrate_dns_hint":  "Update the DNS A-record for domain",
     "server_endpoint_label":  "Endpoint",
     "support_title":  "Support the project",
     "support_intro":  "If this panel helps you, you can support development. Choose a convenient method below.",