Issue #3312107: Highlighting should be applied for whole words

The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),

and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).

## [Unreleased changes]

- #3312107: Highlighting should be applied for whole words

## [2.8.2]

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

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