* Parse Markdown to support translation.
This upgrades from just splitting Markdown files on double-newlines, to
using a Markdown parser to break them into more appropriate chunks. The
upshot is that code samples are all in one message, lists are bundled
together, and generally it should be easier to translate.
* [WIP] helper to update po files for new translation
* process synthetic input file-by-file
* review comments
* remove temporary code
* fix msgfmt lints
* Make i18n-helpers a requirement
* Skip mdbook-gettext for mdbook-xgettext
* Gettext finds PO file based on `book.language`
* Update workflow
No need to set `preprocessor.gettext.po-file`.
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Co-authored-by: Jooyung Han <jooyung@google.com>
* Move Cargo.toml for exercises to exercises directory.
* Create a workspace with both exercises and i18n-helpers.
* Build in CI as well as testing.
* Binaries must have a main function.
* No need for workspaces configuration for caching anymore.
