Event enhancements 1 (rauversion#107)

* background images, label on uploader

* flatpickr, event date tweaks

* scheduling settings, pickr

* date picker on tickets

* track component gtx

* flatpkr css

* more gettext

README.md

@@ -55,5 +55,8 @@ Photo by <a href="https://unsplash.com/@dancristianpaduret?utm_source=unsplash&u
 Photo by <a href="https://unsplash.com/@grittzheng?utm_source=unsplash&utm_medium=referral&utm_content=creditCopyText">Gritt Zheng</a> on <a href="https://unsplash.com/s/photos/music-studio?utm_source=unsplash&utm_medium=referral&utm_content=creditCopyText">Unsplash</a>
 
 Photo by <a href="https://unsplash.com/@saiharishk?utm_source=unsplash&utm_medium=referral&utm_content=creditCopyText">Sai Harish</a> on <a href="https://unsplash.com/?utm_source=unsplash&utm_medium=referral&utm_content=creditCopyText">Unsplash</a>
+
+Foto de <a href="https://unsplash.com/@denitdao?utm_source=unsplash&utm_medium=referral&utm_content=creditCopyText">Denys Churchyn</a> en <a href="https://unsplash.com/es/s/fotos/black-background-gradient?utm_source=unsplash&utm_medium=referral&utm_content=creditCopyText">Unsplash</a>
+