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

From Cascading and Inheritance:

If a shorthand is specified as one of the CSS-wide keywords, it sets all of its sub-properties to that keyword […].

It should be probably handled by the expander decorator.

This issue is a summary of several To-dos found by developers.

• Replace path strings with std::filesystem::path / fs::path
  • AudioController: replace std::string with fs::path
  • Plugin: replace std::string with fs::path
  • ...
• Replace fs::path::string calls with fs::path::u8string, if the result is used to display paths.
• Cre