- Server replicates a ?lang= override onto the navigation links it
renders (nav, sidebar, cards, brand), so clicks and prefetches stay in
the chosen language even without JS; link_lang is part of the ETag and
body cache key (query and header renders of the same language differ
in their links).
- pagerite.js drops the Accept-Language header hack: the remembered
language rides internal fetches as ?lang= instead (added when a link
lacks one), the page cache keys on path+query, and history/address bar
keep the pretty query-less URL.
- Canonical names the actually served language (plain URL for the
original, ?lang= for translations); hreflang alternates are site-wide
from translate_langs, identical on every page: x-default (the plain
autodetecting URL) first, then every language explicitly, default
included, emitted right after canonical before the social tags.
LeoVasanko
14a37f5ab3