While digging into standard.site and applications based on it, I came to realize that there does not seem to be any locale property declaring the language a document or publication is written in.
This makes it harder to discover content in non-English languages I (want to) speak.
Furthermore, a way for documents similar to HTML link's rel=alternate to reference translations of the same document in other locales would be very handy for multilingual blogs like mine (I blog in English on korz.dev and in German on niklaskorz.de, all articles have a translated 1:1 mapping to the other). In that sense, I could imagine it would be handy to have both alternate relations between publications as well as between documents across publications, so that the English and German variants of my blog could be separate publications while the documents may still refer to each other as translated variants cross-publication.
Coming soon! https://tangled.org/standard.site/standard.site/commit/9fbd51deb19c93ebea8193862b81e72df09e00f3
Still considering what would be the best way to handle multiple translations.