Issue #3310065: Too small spacing at the bottom of the quiz page and on mobile

## Unreleased changes

- The lesson title will be displayed without cutting, no matter how long it is.

- Add redirect from "#section-X" to "#page-X" for lessons.

- Fixed bottom spacing for quiz page and mobile layout.

- Adjusted "Make available offline" button text when processed.

## [2.8.1]

- Fixed spacing for the lesson sidebar and lesson mobile navigation.