Fix linking existing VPN clients (WireGuard/service protocols and API errors).

Co-authored-by: Cursor <cursoragent@cursor.com>

translations/en.json

@@ -158,6 +158,7 @@
   "conn_name_panel": "Connection name (in panel)",
   "user_conns_title": "User connections",
   "no_free_conns": "No free connections",
+  "select_connection": "Please select a connection",
   "linking": "Linking...",
   "conn_linked": "Connection linked",
   "enabling": "Enabling",

translations/fa.json

@@ -156,6 +156,7 @@
   "conn_name_panel": "نام اتصال (در پنل)",
   "user_conns_title": "اتصال‌های کاربر",
   "no_free_conns": "اتصال آزاد موجود نیست",
+  "select_connection": "لطفا یک اتصال انتخاب کنید",
   "linking": "در حال اتصال...",
   "conn_linked": "اتصال برقرار شد",
   "enabling": "در حال فعال‌سازی",

translations/fr.json

@@ -156,6 +156,7 @@
   "conn_name_panel": "Nom (dans le panneau)",
   "user_conns_title": "Connexions utilisateur",
   "no_free_conns": "Aucune connexion libre",
+  "select_connection": "Veuillez sélectionner une connexion",
   "linking": "Liaison...",
   "conn_linked": "Connexion liée",
   "enabling": "Activation",

translations/ru.json

@@ -158,6 +158,7 @@
   "conn_name_panel": "Имя подключения (в панели)",
   "user_conns_title": "Подключения пользователя",
   "no_free_conns": "Нет свободных подключений",
+  "select_connection": "Выберите подключение",
   "linking": "Привязка...",
   "conn_linked": "Подключение привязано",
   "enabling": "Включение",

translations/zh.json

@@ -156,6 +156,7 @@
   "conn_name_panel": "连接名称 (面板显示)",
   "user_conns_title": "用户连接列表",
   "no_free_conns": "无可用空闲连接",
+  "select_connection": "请选择一个连接",
   "linking": "关联中...",
   "conn_linked": "连接关联成功",
   "enabling": "启用中",