feat(meditate): the library says what a recording speaks, and shows the languages chosen (ADR 0038, D17)

An item's page names its spoken language. Where the library has several,
its cards do too and Explore offers them, several at once, none meaning
every one, kept in the person's sealed settings. A library with one
language asks nothing.

Whats-New: The library says each recording's spoken language, and Explore lets you choose among several.
Whats-New-De: Die Bibliothek nennt die gesprochene Sprache jeder Aufnahme, und bei mehreren wählst du sie in „Entdecken“ aus.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Signed-off-by: Tizian 「ティツィアーン」 <raisondetredev@pm.me>

docs/adr/0038-halkyon-meditate.md

@@ -287,6 +287,13 @@ names and pictures are its own). Everything below is Halkyon's own.
     Caddy forwarding `/library/*` to the web server with the rest, `check_library`
     compiled into the image so an operator checks a folder on the host.
 
+- **D17 What a recording speaks** (5 Nov 2026, the developer's request): an item's page
+  says its spoken language; where the library has several, its cards do too and Explore
+  offers them, several at once, none meaning every one, kept in the person's sealed
+  settings (`libraryLanguages`). Languages group by their primary subtag (`de-CH` with
+  `de`). A library with one language asks nothing, and a choice no longer offered is
+  dropped, so that a choice never hides a library.
+
 ## Steps
 
 1. **The shell** (3 Nov): Todo's copied and renamed, its features left out, the three tabs