Looks fine in light mode, text unreadable in dark mode.

Describe the bug
When exporting annotation with Flashcard, the JSON line is undefined

    },
    undefined,
    {

To Reproduce
Steps to reproduce the behavior:

1. Annotate a line of text
2. Add a Flashcard with data on back and front
3. Export annotation as JSON
4. Search "undefined" you should get to that badly exported entry

Expected behavior

Fla

Is your feature request related to a problem? Please describe.
I use xournalpp without the sidebar and recently spent a long time trying to figure out how, or if it was possible, to reorder pages. Looking through the wiki and web site and I could not find any mention but some issues here said "right click on the page and select move up" but right clicking on a page's blank area did nothing fo