- Have an explicit contextual class on `cover-container`.
- Use more flexible, consistent and searchable variable name for passing classes to covers.
- Consistently use `'…'` with django variables.
- Give the option to not hide covers to screen readers.
- consitently give a title to the cover container if `alt_text` exists.
- [lists] Remove `.content` which is applying too extensive default styles.
- Add template for identifiers.
- Remove `space-between` that adds too much space on narrow views.
- Apply the `content` class only on publisher infos to avoid applying automatic styles to the description list.
