add selinux tip

Signed-off-by: fufesou <shuanglongchen@yeah.net>

src/lang/cn.rs

@@ -565,5 +565,6 @@ pub static ref T: std::collections::HashMap<&'static str, &'static str> =
         ("Open in new window", "在新的窗口中打开"),
         ("Show displays as individual windows", "在单个窗口中打开显示器"),
         ("Use all my displays for the remote session", "将我的所有显示器用于远程会话"),
+        ("selinux_tip", "SELinux 处于启用状态，RustDesk 可能无法正常运行。"),
     ].iter().cloned().collect();
 }