- Add a [language] table to book.toml. Each key in the table defines a
new language with `name` and `default` properties.
- Changes the directory structure of localized books. If the [language]
table exists, mdBook will now assume the src/ directory contains
subdirectories named after the keys in [language]. The behavior is
backwards-compatible if you don't specify [language].
- Specify which language of book to build using the -l/--language
argument to `mdbook build` and similar, or omit to use the default
language.
- Specify the default language by setting the `default` property to
`true` in an entry in [language]. Exactly one language must have `default`
set to `true` if the [language] table is defined.
- Each language has its own SUMMARY.md. It can include links to files
not in other translations. If a link in SUMMARY.md refers to a
nonexistent file that is specified in the default language, the renderer
will gracefully degrade the link to the default language's page. If it
still doesn't exist, the config's `create_missing` option will be
respected instead.
