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i18n: live-swap chat sidebar labels on language toggle

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The strategic log content already refreshes via HTMX on lang-changed
(server-side translation lookup), but the chat sidebar's static labels
— title, hint, helper lede, textarea placeholder, Send button — were
baked into the HTML by Jinja at page render and only updated after a
full reload.

Add a tiny client-side i18n dictionary (CASSANDRA_I18N) plus
applyI18n(lang) in base.html. cassandraSetLang() now calls
applyI18n(newLang) right after the language PATCH succeeds and before
firing the HTMX triggers, so labels swap in step with the AI content.

Convention: <element data-i18n="key">…</element> sets textContent;
<input data-i18n-placeholder="key" …> sets .placeholder. Initial
render still goes through the existing {% if user_lang == 'it' %}
Jinja blocks so there's no flash of English on page load for IT users
— applyI18n is a no-op until the toggle is clicked.

Only the chat sidebar has bindings today. Adding more labels later is
a matter of dropping a key into the dict and tagging the element.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
This commit is contained in:
Giorgio Gilestro 2026-05-29 12:01:28 +02:00
parent 48f022b71b
commit fca05aef7a
2 changed files with 41 additions and 15 deletions
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36
app/templates/base.html
View file

@ -154,6 +154,40 @@
try { localStorage.setItem('cassandra.theme', newTheme); } catch (e) {}
};
// Static-label i18n dictionary. AI-generated content is re-fetched via
// HTMX (server-side translation), but plain UI labels are baked into
// the HTML at render time. This dict + applyI18n() below let the
// language toggle swap labels live without a page refresh.
// Convention: <element data-i18n="key">… (sets textContent),
// <element data-i18n-placeholder="key" placeholder="…"> (sets .placeholder).
// First-render correctness is handled by the template's
// {% if user_lang == 'it' %} block — applyI18n only kicks in on
// subsequent toggle events.
window.CASSANDRA_I18N = {
'chat.title': { en: 'Ask Cassandra',
it: 'Chiedi a Cassandra' },
'chat.hint': { en: 'grounded on the latest log + live data',
it: "basato sull'ultimo log + dati in tempo reale" },
'chat.lede': { en: "Ask about today's analysis. The model sees the latest strategic log, live market readings across all groups, and the last 24h of thesis-filtered headlines. Refresh wipes this conversation.",
it: "Fai domande sull'analisi di oggi. Il modello vede l'ultimo log strategico, le quotazioni di mercato in tempo reale per tutti i gruppi e le ultime 24h di titoli filtrati per tesi. Un refresh della pagina cancella questa conversazione." },
'chat.placeholder': { en: 'e.g. why is the defence sleeve flat through Hormuz?',
it: 'es. perché il comparto difesa è piatto nonostante Hormuz?' },
'chat.send': { en: 'Send',
it: 'Invia' },
};
window.cassandraApplyI18n = function (lang) {
document.querySelectorAll('[data-i18n]').forEach(function (el) {
var key = el.getAttribute('data-i18n');
var entry = window.CASSANDRA_I18N[key];
if (entry && entry[lang] != null) el.textContent = entry[lang];
});
document.querySelectorAll('[data-i18n-placeholder]').forEach(function (el) {
var key = el.getAttribute('data-i18n-placeholder');
var entry = window.CASSANDRA_I18N[key];
if (entry && entry[lang] != null) el.placeholder = entry[lang];
});
};
window.cassandraSetLang = async function (newLang) {
var pill = document.getElementById('lang-toggle');
if (!pill) return;
@ -170,6 +204,8 @@
body: JSON.stringify({lang: newLang}),
});
if (!r.ok) throw new Error('HTTP ' + r.status);
// Swap any static UI labels that have i18n bindings.
window.cassandraApplyI18n(newLang);
// Trigger HTMX-driven panels to re-fetch in the new language.
// Same shape as cassandraSetTone — every panel that listens to
// tone-changed also listens to lang-changed.