Major changes in 3.27.90:
* Big code refactorings that lead to more stability and ease of maintainership
* Follow-up improvements after rewritting the Month view
* Flatpak Nightly now builds with debug and tracing enabled
* Huge memory leaks were fixed
* Updates translations

Major changes in 3.27.2:
* Events now are rendered differently if they are all-day or timed
* Rewrite of the Month view
    * Month cells have more transitions and effects
    * The day number is above the cells
    * A new overflow popup window was introduced
    * Right-to-left languages are fully working now
* Plug some memory leaks (Florian Brosch)
* Improve filename handling when adding new calendars (Florian Brosch)
* Updates translations