1.18.4

• Fix ntfy issue in 1.18.1 again, username is no longer required
• Add Greek Language (Thanks @VasilisThePikachu)

Thank you all contributors! Bug fix, code refactoring, language files update, code review and more!
(Let me know if I forget to add your name if your pull request have been merged in this version)
@wellart @Computroniks @AnnAngela @falentio