The different translations of the same file are side by side in the
tree, and are identified by a language code in the file name extension.
Example: `_index.fr.md` is the French translation of `_index.en.md`.
Please note that a missing translation file will not appear in the menus of the generated site.
**Always make sure to create files for all languages**, even if the translation is not yet available.
For this, there is a script `doc-generate-missing-translations.sh` in the root of the repository. When you add a new file, you just have to create the english version, then run this script. It will create all missing translations, putting a sample message inviting the user to read the english version.