For multilingual sites you can add a languages section in the site.yaml. The example section below defines two languages.
languages:
de:
name: Deutsch
en:
name: English
The language code will be used as a prefix for collection URLs if a document has the language attribute set to the corresponding code. For example the collection of English documents tagged with example would be available at /en/tags/example/ and German documents tagged with beispiel at /de/tags/beispiel/. You can use the i18n site as a starting point for creating a multilingual site: logya create --site i18n mysite.