A second language, one release later
1.9 brought the second language: one post, a text in each language, an /en/ tree beside the root. The first site to run it for real was the one the engine grew up on, and a month of that showed what no test shows. The 1.10 changelog has over thirty entries about the second language. This is not their list. It is about what a second language needs that the first one does not.
A name that inflects
site.author stands in sentences: "na osobním webu Daniela Šnora". Czech inflects a name, so the configuration holds the genitive, and the pages in English took it over, case and all. 1.10 adds site.author_name: the name as it stands alone — under a hero title, as the person the structured data names, on the pages of a language other than the site's own. Without it author is used everywhere, as before. A language that does not inflect never needed it, which is why nobody wrote it.