- Fix bug that prevented adding vacation days in the future 🐛

A huge thank you to all contributors and translators, especially Mubeen. 😘
Feel welcome to report issues and submit fixes on https://github.com/Crazy-Marvin/VacationDays/ or translations on https://hosted.weblate.org/engage/vacation-days/. 🚀
And of course, enjoy your vacations because you are awesome! 🏖️
