replace pkexec with gtk sudo (#9383)

* Fix https://github.com/rustdesk/rustdesk/issues/9286, replace pkexec
  with gtk sudo. Tested on gnome (ubuntu 22.04, debian 13), xfce (manjaro, suse), kde (kubuntu 23), lxqt (lubuntu 22), Cinnamon (mint 21.3), Mate (mint 21.2)
* Fix incorrect config of the main window opened by the tray, replace
  xdg-open with run_me, replace with dbus + run_me
* Fix `check_if_stop_service`, it causes the problem fixed in
  https://github.com/rustdesk/rustdesk/pull/8414, now revert that fix and fix itself.

Signed-off-by: 21pages <sunboeasy@gmail.com>

src/lang/be.rs

@@ -645,5 +645,7 @@ pub static ref T: std::collections::HashMap<&'static str, &'static str> =
         ("Resume", ""),
         ("Invalid file name", ""),
         ("one-way-file-transfer-tip", ""),
+        ("Authentication Required", ""),
+        ("Authenticate", ""),
     ].iter().cloned().collect();
 }