timeout of webrtc fallback to delay

src/lang/cn.rs

@@ -778,5 +778,7 @@ pub static ref T: std::collections::HashMap<&'static str, &'static str> =
         ("The screen sharing request ended without completing on the remote device", "远程设备上的屏幕共享请求已结束，但未完成"),
         ("RustDesk could not obtain a usable screen from the XDG Desktop Portal, the PipeWire library may be too old", "RustDesk 无法从 XDG Desktop Portal 获取可用的屏幕，PipeWire 库可能过旧"),
         ("RustDesk could not load a GStreamer component needed for screen capture ({})", "RustDesk 无法加载屏幕捕获所需的 GStreamer 组件 ({})"),
+        ("Relay fallback delay in seconds", "回落到中继前的等待时间（秒）"),
+        ("relay-fallback-delay-tip", "已经建立的中继连接会等待直连的 WebRTC 多久，超过这个时间就改用中继。调大可以让较慢的直连有更多机会胜出；调小则在无法直连的网络上更快回落到中继。留空表示使用默认值 2.5 秒。"),
     ].iter().cloned().collect();
 }