Better label in the shortcut window

data/gtk/help-overlay.blp

@@ -10,7 +10,7 @@ ShortcutsWindow help_overlay {
       title: "Application";
 
       ShortcutsShortcut {
-        title: "Set timer";
+        title: "Set target time";
         action-name: "win.set-timer";
       }
     }