For content, you basically put blogarticle.en.md and blogarticle.fr.md next to each other it will treat it as the same article in different languages. Per default it puts different language websites into different subdirectories (with a default language at root level) but it also supports multi hosts setups where you can define different domains for each language (e.g. blog.de and blog.fr). There's support for generating "this article in other languages" type menus, which allows you to crosslink the website across languages. There's also i18n support for translating stuff in templates etc., where you provide a dictionary file with translated versions of each string, and it'll replace them based on the language of the current article (useful for stuff like navigational menus etc.).