Major changes in 50.alpha:
* Various updates to the Flatpak manifest
* Minor tweaks to the coloring of event widgets
* Various accessibility fixes all around
* Performance improvements in the Month view
* More prominent month name in the Month view
* Improved scrolling animations in the Month view
* Improved alignment of event widgets in the Month view
* Plug a bunch of memory leaks in the Quick Add popover
* Update the design of the Quick Add popover
* Plug dozens of memory leaks in tests and in the app
* Announce the number of search results to the screen reader
* Respect the new GSetting for first weekday
* Updated translations