fb5 UI-TW: the machine-translation mark — _meta.machineTranslated: true, a new optional manifest field of a language pack (docs/PACKS.md): shared/i18nPacks.js langFields reads it (true or false), shared/packs.js normalizeManifest warns about a value that is not a boolean (read as false; the pack still loads) and packIndexEntry passes it into the index entry like complete (only when true), so the client's registry has it from the index (langMetaOf → registerLangs → langInfo) or from the pack's own _meta without one; 设置 shows a note under the language switch while the CURRENT language's pack has it (ui/lang.js machineTranslationNote, msgid 「当前语言的界面文字为机器翻译，可能不够准确，欢迎在 GitHub 上指正。」 — English in en.json, 目前語言的介面文字為機器翻譯… in zh-TW.json; ja / ko leave it to the integrator); tests: test/i18n-packs.test.js (the field from the manifest through the index to langInfo, the warning, the shipped zh-TW manifest, the note shown / hidden by language), test/ui/i18n.e2e.test.js (the shipped packs' own UI strings read from their files — zh-TW now 開始 — and the 设置 note, none in Chinese); docs/I18N.md says how the zh-TW pack is made (OpenCC twp, the official TW terms, a manual pass; a later msgid the same way) and that the ja / ko strings are machine translations open to corrections (edit public/i18n/<code>.json, node tools/i18n.mjs check <code> --strict)

public/js/ui/lang.js

@@ -15,7 +15,7 @@
 
 import { useEffect, useState } from '../../vendor/hooks.module.js';
 import {
-  DEFAULT_LANG, normalizeLang, getLang, setLang, onLangChange, addMessages, setNameResolver, tName, format, translateWire, t,
+  DEFAULT_LANG, normalizeLang, getLang, setLang, onLangChange, addMessages, setNameResolver, tName, format, translateWire, t, N_,
   registerLangs, getLangs, langInfo, langChain, onLangsChange, setI18nWarn,
 } from '../../../shared/i18n.js';
 import { canonicalLang, computeChain, scriptOf } from '../../../shared/i18nPacks.js';
@@ -270,6 +270,19 @@ export function langMenuModel(langs, current) {
   return { kind: items.length > SEGMENTED_MAX ? 'select' : 'buttons', items };
 }
 
+/** The note itself (a msgid: each pack words it in its own language). */
+const MACHINE_TRANSLATION_NOTE = N_('当前语言的界面文字为机器翻译，可能不够准确，欢迎在 GitHub 上指正。');
+
+/**
+ * The note under the language switch in 设置 (ui/settings.js): while the current language's pack is marked as a machine
+ * translation (`_meta.machineTranslated`, docs/PACKS.md) it says so, in that language; null otherwise (Chinese, English,
+ * a pack translated by hand). Only the current pack counts, not its base or fallbacks.
+ * @returns {string | null}
+ */
+export function machineTranslationNote() {
+  return langInfo(getLang())?.machineTranslated === true ? t(MACHINE_TRANSLATION_NOTE) : null;
+}
+
 /**
  * The language menu: 中文 | English | … as buttons, or a list when there are many packs.
  * @param {{ class?: string }} props