- neutrino: add additional key to leave standby mode; unify standby locales

This re-adds an old feature from dbox2, but uses a more configurable way

Signed-off-by: Thilo Graf <dbt@novatux.de>

src/system/settings.h

@@ -535,6 +535,7 @@ struct SNeutrinoSettings
 	int key_list_start;
 	int key_list_end;
 	int key_power_off;
+	int key_standby_off_add;
 	int menu_left_exit;
 	int timeshift_pause;
 	int auto_timeshift;