Better Quacking

• 🌑 Dark-mode toggle on the header bar
• 🔔 Notifications now stick around until you close them, to make sure you don't miss your quacks
• 🌟 Support for additional GTK themes, making Reminduck distro-agnostic
• 🇪🇸 Spanish Translation (Alejandro Elí | @onerbs)
• 🇮🇹 Italian Translation (Mirko Brombin | @mirkobrombin)