- New editor-shell tab (lang): translatable languages as clickable flag
tiles (shared langs.js mapping of the 28 Seed-X languages to flags),
saved via the settings round-trip; translator service URL(s) shown.
- Bootstrap seeds translate_langs with Spanish and Chinese (the original
language is never a target).
- GET /_api/settings also returns primary_lang.
- PageEditor's flag/name helpers move to the shared langs.js.
