refact: macos, update, preparing for installation (#12581)

Signed-off-by: fufesou <linlong1266@gmail.com>

src/lang/template.rs

@@ -708,5 +708,6 @@ pub static ref T: std::collections::HashMap<&'static str, &'static str> =
         ("Failed to check if the user is an administrator.", ""),
         ("Supported only in the installed version.", ""),
         ("elevation_username_tip", ""),
+        ("Preparing for installation ...", ""),
     ].iter().cloned().collect();
 }