M14: expand Traditional Chinese UI, dialogs and language preferences (#140)

* i18n: Czech interface language

Adds Czech (Čeština, code `cs`) next to English and Japanese:
Preferences ▸ Interface language, `ui.set language cs`, `ui.state`
and persisted preferences all accept it.

- i18n: `Language::Cs`; `tr()` picks the language's table with a match
  (English has none), panic-free. The CZECH table (83 entries) covers
  every label passed to `.tr("…")` (main menu, View zoom/theme/side-panel
  entries, Preferences dialog), every registered File/Edit/Pages/View/Help
  command shown by `registry_menu`, and every key of the Japanese table.
  Written clean-room from the English meaning, not from any Acrobat
  localisation.
- Tests: Czech covers every registered menu title and label, every
  `.tr("…")` literal found by scanning the crate's sources, and the
  Japanese keys; nothing is left identical except an explicit KEEP_AS_IS
  list ("OK"); ellipses match the source; keys are unique per language;
  `cs` round-trips through set_option, ui.set/ui.state and persistence.
- theme: the font setup is split into `font_definitions()`, and a test
  checks with skrifa (dev-dependency, already in the tree via egui) that
  Inter Regular/Medium/SemiBold and JetBrains Mono draw all Czech letters
  and every Czech translation, so nothing falls back to Shippori Mincho.
- The `language` error lists `cs`; docs/localization.md, the parity note
  for misc.prefs-language and the ROADMAP log mention Czech.

Co-Authored-By: Claude Opus 5.5 (1M context) <[email protected]>

* M14: translation catalogs, same system as PhotoCraft

Move the interface translations to PhotoCraft's i18n system: one TSV
catalog per language (crates/ui-egui/src/i18n/ja.tsv), the tl! macro,
entries keyed by command id, context or plural forms, and catalog tests
(format, duplicates, placeholders, command ids).

The 49 existing Japanese strings move over unchanged, plus "Auto". The
language preference now defaults to "auto" and follows the system
language (English when it has no catalog); "en" and "ja" still persist
and unknown values are rejected.

Update docs/localization.md, ROADMAP.md and the misc.prefs-language
parity entry.

Co-Authored-By: Claude Opus 5.5 (1M context) <[email protected]>

* M14: add Traditional Chinese (Taiwan) UI localization

Co-Authored-By: Codex <[email protected]>

* M14: translate shortcuts and expose language preferences in Edit menu

Add command-comma and verify language switching through the actual selector.

Co-authored-by: Codex <[email protected]>

* M14: expand Traditional Chinese dialogs, panels and diagnostics

Preserve opaque values in translated templates and keep application diagnostics at the UI boundary. Extend native control and template regression coverage.

Co-authored-by: Codex <[email protected]>

* M14: finish Traditional Chinese signature prompts and history labels

Translate generated action labels without changing filenames or field names. Complete checkbox styles, resolution labels and native picker filters.

Co-authored-by: Codex <[email protected]>

* M14: complete Japanese dialogs, panels, shortcuts and diagnostics

Expand Japanese from 49 to 1830 interface entries, expose language preferences in the Edit menu, preserve opaque template and history values, and localize known application diagnostics only at the UI boundary. Add control, persistence, template and desktop/web glyph regressions.

Co-authored-by: Codex <[email protected]>

* i18n: add Brazilian Portuguese (pt-br) UI translation

Adds Language::PtBr (code pt-br, endonym Português (Brasil)) with serde rename so it persists as "pt-br", registers it in Language::ALL (Preferences ▸ Interface language and ui.set/ui.state) and translates the same 49 menu/command keys as the Japanese table. Extends the i18n tests (table parity, codes, persistence) and updates docs/localization.md.

* M14: strict catalog validation, one-pass fmt, translation assets

Fold in the infrastructure parts of #175:
- `fmt` fills placeholders in one pass, so inserted values (a file name
  containing `{n}`) are never substituted again.
- Catalog validation rejects unknown escapes, unknown `@` contexts,
  placeholder, ellipsis and plural-form mismatches and duplicates. The
  bundled catalogs must have no errors (tests); at run time a bad line is
  still only skipped and logged, so the rest of the catalog loads.
- `.tsv` files count as assets in `cargo xtask assets`, with a
  `translation` kind that may never come from Adobe; ja.tsv gets its
  ATTRIBUTION.toml entry.
- Control-channel test: switching the language keeps documents, their
  dirty state and command ids.

Also make the drawing language thread-local, as in PhotoCraft, so
parallel kittest harnesses can't change each other's language.

Co-Authored-By: 才倾梦华V <[email protected]>
Co-Authored-By: Claude Opus 5.5 <[email protected]>

* M14: Brazilian Portuguese as a TSV catalog

Move #165's Portuguese table into crates/ui-egui/src/i18n/pt-br.tsv
(same 49 strings, plus Auto) and register it in LANGUAGES with
PhotoCraft's Portuguese plural rule (0 and 1 singular). Any Portuguese
locale (pt_BR, pt_PT, pt) follows the Brazilian catalog, as in
PhotoCraft. The catalog is an attributed asset (ATTRIBUTION.toml), and
the docs and parity notes list the new code.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

* M14: Czech as a TSV catalog

Move #68's Czech table into crates/ui-egui/src/i18n/cs.tsv (PrintCraft
labels renamed PdfCraft, plus Auto) and register it with PhotoCraft's
Czech plural rule (one / few / other). #68's tests become catalog
tests: Czech covers every registered menu title and menu command label,
keeps ellipses, uses no three-dot ellipsis or stray whitespace, and only
leaves "OK" untranslated; the code persists and `cz` is rejected. The
source-scanning `.tr("…")` test is dropped: strings now go through tl!
and the catalog tests check consistency.

The font-coverage test moves to tests/fonts.rs and covers both Latin
catalogs (cs, pt-br) against Inter and JetBrains Mono. It keeps skrifa
as a dev-dependency (the version pdfcraft-fonts already uses): egui's
has_glyphs can't answer it, since a family with only the primary face
also uses that face as its replacement face.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

* M14: route every UI string through the catalog; Japanese as ja.tsv

Port #141's wiring to the catalog API from land/106:
- `crate::i18n::tr(ui, s)` becomes `tl!(s)`, `tr_fmt`/`tr_template`
  become `i18n::fmt(tl!(..), ..)`, and `Language::get`/`store` (the
  egui temp-data copy of the language) are gone: the drawing language
  is the per-thread `i18n::current()`, set from the preference at the
  start of each frame. Worker threads (export, OCR, batch actions) take
  the UI's language with them for their summaries.
- ja.rs (1,830 pairs) becomes ja.tsv, merged with the existing entries
  and renamed PrintCraft -> PdfCraft. The 29 diagnostic templates of
  errors.rs are dropped.
- `Language::diagnostic` and errors.rs are dropped: matching engine and
  OS messages against English templates breaks silently whenever the
  wording changes. Error details are shown as they are, inside the
  translated frame ("{label} failed: {e}").
- History labels (`command_label`/`action_label`) move into i18n and keep
  captured file and field names; registry menus prefer `@id` entries.
- Preferences: Auto plus every registered language, relabelled at once.
- Tests: Japanese covers every command and All tools entry; Japanese
  labels have glyphs with the desktop faces and with the web subset
  (with craft-fonts); history labels; #141's control tests, with the
  error-detail expectation updated.

Co-Authored-By: shuiyue-cmyk <[email protected]>
Co-Authored-By: Claude Opus 5.5 <[email protected]>

* M14: Preferences in the Edit menu, Cmd/Ctrl-comma

Split out of #141: register app.preferences in the Edit menu with the
platform's usual shortcut (Command-comma on macOS, Ctrl-comma
elsewhere), so the interface language can be found and changed with no
document open. Shortcut keys may now be punctuation (egui's key name
","). #141's control test drives the menu item, the language selector
and the shortcut in Japanese and English.

Co-Authored-By: sakamoto824 <[email protected]>
Co-Authored-By: Claude Opus 5.5 <[email protected]>

* M14: Traditional Chinese as zh-hant.tsv

Reduce #140 to its translations: zh_tw.rs becomes
crates/ui-egui/src/i18n/zh-hant.tsv (PrintCraft renamed PdfCraft; the
29 errors.rs diagnostic templates dropped, as for Japanese) and one
registry row, code `zh-hant` (Taiwan vocabulary). Locales zh_TW, zh_HK,
zh_MO and zh-Hant-* resolve to it. #140's own copy of the UI wiring and
its errors.rs diagnostics are not taken: land/141 carries the wiring.
Tests: registration, locale mapping, every command label translated.
The catalog is an attributed asset; docs, ROADMAP and parity list it.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

---------

Co-authored-by: Petr Leo Compel <[email protected]>
Co-authored-by: Claude Opus 5.5 (1M context) <[email protected]>
Co-authored-by: Simon Leblanc <[email protected]>
Co-authored-by: Codex <[email protected]>
Co-authored-by: RicSchonfelder <[email protected]>
Co-authored-by: Brandon Thomas <[email protected]>
Co-authored-by: 才倾梦华V <[email protected]>
Co-authored-by: shuiyue-cmyk <[email protected]>

ATTRIBUTION.md

@@ -4,10 +4,11 @@
 
 Every asset PdfCraft includes, bundles or uses to build its published material, with its author, source and licence. The policy is in [AGENTS.md](AGENTS.md) §1. The machine-readable list, with SHA-256 hashes, is [ATTRIBUTION.toml](ATTRIBUTION.toml). Licence texts are kept beside the assets and summarised in [NOTICE](NOTICE).
 
-## In this repository (245)
+## In this repository (246)
 
 | Asset | Title | Author | Licence | Source | Used for |
 |---|---|---|---|---|---|
+| `crates/ui-egui/src/i18n/zh-hant.tsv` | Traditional Chinese (Taiwan) interface translation catalog | PdfCraft contributors | MIT OR Apache-2.0 | Contributor-original: clean-room translations of PdfCraft's English UI labels, no proprietary localisation resources | Traditional Chinese UI strings, compiled in by crates/ui-egui/src/i18n/mod.rs |
 | `crates/ui-egui/src/i18n/cs.tsv` | Czech interface translation catalog | PdfCraft contributors | MIT OR Apache-2.0 | Contributor-original: clean-room translations of PdfCraft's English UI labels, no proprietary localisation resources | Czech UI strings, compiled in by crates/ui-egui/src/i18n/mod.rs |
 | `crates/ui-egui/src/i18n/pt-br.tsv` | Brazilian Portuguese interface translation catalog | PdfCraft contributors | MIT OR Apache-2.0 | Contributor-original: clean-room translations of PdfCraft's English UI labels, no proprietary localisation resources | Brazilian Portuguese UI strings, compiled in by crates/ui-egui/src/i18n/mod.rs |
 | `crates/ui-egui/src/i18n/ja.tsv` | Japanese interface translation catalog | PdfCraft contributors | MIT OR Apache-2.0 | Contributor-original: clean-room translations of PdfCraft's English UI labels, no proprietary localisation resources | Japanese UI strings, compiled in by crates/ui-egui/src/i18n/mod.rs |

ATTRIBUTION.toml

@@ -10,6 +10,17 @@
 # licence: SPDX expression from the allowlist in AGENTS.md §1.2. adobe_data = true marks the closed list of
 # Adobe-authored non-visual technical data allowed by AGENTS.md §1.1.
 
+[[asset]]
+path = "crates/ui-egui/src/i18n/zh-hant.tsv"
+title = "Traditional Chinese (Taiwan) interface translation catalog"
+author = "PdfCraft contributors"
+source = "Contributor-original: clean-room translations of PdfCraft's English UI labels, no proprietary localisation resources"
+licence = "MIT OR Apache-2.0"
+licence_file = "LICENSE-MIT"
+kind = "translation"
+usage = "Traditional Chinese UI strings, compiled in by crates/ui-egui/src/i18n/mod.rs"
+sha256 = "0448bc95a4046ec6cee88b02faed799b1917c19fe0f47d30febb9eb6b5c3b3d8"
+
 [[asset]]
 path = "crates/ui-egui/src/i18n/cs.tsv"
 title = "Czech interface translation catalog"

ROADMAP.md

@@ -103,7 +103,7 @@ Hours are for a single agent (low–high). "Done" is the estimated fraction of t
 | M11 | Optimize, preflight, PDF/A/X/UA, print production | 200–350 | 18% | 165–290 | Done: new `optimize` crate: Reduce File Size and the PDF Optimizer (images measured where drawn, bicubic downsampling, JPEG/ZIP recompression only when smaller, discard objects and user data, Flate clean-up, resource merging, object streams). Missing: fonts and transparency panels, space audit, preflight, PDF/A/X/UA |
 | M12 | Accessibility, compare, measure, search, XFA | 200–380 | 20% | 160–305 | Done: new `a11y` crate with the Accessibility Checker (all 32 rules, report, Fix/Skip/Explain, options dialog and results panel, agent tools). Missing: autotag, Tags/Order/Content panels, Reading Order tool, alt-text workflow, compare, measure, search index, XFA |
 | M13 | Automation (MCP, Action Wizard, CLI) + AI providers | 60–120 | 45% | 33–66 | Done: MCP resources (document info, text, page images); headless tool table (123 tools incl. signing, optimizing, initial view, links, stamps, data exchange, comment review, forms authoring and scripts, redaction, sanitize, print, add content), opt-in MCP server over stdio, CLI `run`/`tools`, UI control channel with drag. Missing: Action Wizard, AI providers |
-| M14 | 1.0 polish: performance, localization, installers | 120–250 | 5% | 115–240 | Done: PhotoCraft's translation system (`i18n/`: TSV catalogs, `tl!`, command-id and plural entries, system-language detection, strict catalog tests); every dialog, panel and notice goes through `tl!`; Japanese complete for them (≈1,800 entries), Czech and Brazilian Portuguese for menus. Missing: more catalogs filled in, Windows language detection, installers, performance budgets |
+| M14 | 1.0 polish: performance, localization, installers | 120–250 | 5% | 115–240 | Done: PhotoCraft's translation system (`i18n/`: TSV catalogs, `tl!`, command-id and plural entries, system-language detection, strict catalog tests); every dialog, panel and notice goes through `tl!`; Japanese and Traditional Chinese complete for them (≈1,800 entries each), Czech and Brazilian Portuguese for menus. Missing: more catalogs filled in, Windows language detection, installers, performance budgets |
 | | **Total (original plan sizing)** | **2,085–3,840** | **≈ 35%** | **≈ 1,350–2,500 at the planned rate; ≈ 600–1,100 at the measured rate** | |
 
 **Overall progress: about 30–35% of the effort (49.5% of features shipped).** The viewer and the core are far ahead of the editing features, because the viewer was built first so progress could be seen; rendering itself is still borrowed from `hayro`. See [Honest assessment](#honest-assessment-2026-10-05).
@@ -135,6 +135,7 @@ Newest first. One line per session: the date, what moved, and the new overall pe
 
 - **2026-10-07 (fork, default-workspace-mode):** Preferences ▸ Documents and view remembers the workspace used for newly opened PDFs. All Tools remains the default; explicit CLI/control mode overrides last for the session and PDF Initial View metadata stays independent. Overall estimate unchanged (≈ 30–35%).
 
+- **2026-10-07 (community, M14, #140):** Traditional Chinese (繁體中文, `zh-hant`, Taiwan vocabulary) as a catalog of about 1,800 entries; `zh_TW`, `zh_HK`, `zh_MO` and `zh-Hant` locales follow it. Drawn with the craft-fonts CJK faces (missing characters show replacement boxes).
 - **2026-10-07 (community, M14, #141):** Every dialog, panel, notice, shortcut list and native-picker title goes through the catalog (`tl!`, `i18n::fmt`), and Japanese grows from 49 to about 1,800 entries (`ja.tsv`); worker threads (export, OCR, actions) write their summaries in the UI language; history labels keep captured file and field names; the command palette searches translated and English labels and ids. Engine and OS error text is no longer matched against English templates: it is shown as is, inside a translated frame. Localization remains partial for other languages.
 - **2026-10-07 (session 15):** Five community issues, each with a regression test: in two-page view, Next page moves a whole spread (#77, #70); Export to Word opens in Word again, with control characters dropped and receipt-length pages kept within Word's 22 in, checked in Microsoft Word (#78, #72); macOS opens PDFs from Finder, Open With and the Dock (Apple events through the audited `fmv-macos-events`, PDF declared in the Info.plist), and the packaging no longer describes the image editor it was copied from (#82, #73); Add text keeps the box being typed when you click elsewhere, with Done and Discard beside it, reproduced and checked with real OS input (#86, #74); sharper, higher-contrast text, most visible on Windows, with every text colour at WCAG AA in both themes (#84, #76; the console window was already gone in 0.2.1). Still open: #79 (layered "not verified" signature appearances), #80 (native macOS menu bar), #81 (Homebrew and Scoop). P0 88%, P1 53%; 805 features 50.2% shipped (53.7% weighted). ≈ 30–35%.
 - **2026-10-06 (community navigation):** Linux-only middle-button vertical scrolling in the document and Organize grid, toggled by clicking the wheel, with cancellation that protects page tools and selection. Scrolling stays on after releasing the wheel, even if the pointer moved before release. Manual feedback led to a Chromium-style distance^2.2 speed curve, a 15-screen-point dead zone, and continuous redraws that use elapsed frame time; the former linear speed cap is removed. Headless UI/control regressions cover fractional movement, consistent travel at 30/60/120/144 fps, pause/resume and cancellation. Other platforms retain their existing middle-button input behavior, with a regression that checks the custom scroller neither blocks input nor changes the cursor or consumes Escape. No new dependency. Automatic scrolling remains partial because keyboard-started timed scrolling is absent. Overall effort estimate remains ≈ 30–35%.

crates/ui-egui/src/i18n/mod.rs

@@ -70,9 +70,12 @@ fn plural_pt(n: u64) -> usize {
 }
 
 /// The registry. English first: it is the fallback and the source language.
-pub static LANGUAGES: [LangInfo; 4] = [
+pub static LANGUAGES: [LangInfo; 5] = [
     LangInfo { code: "en", name: "English", source: "", plural: plural_one_other, catalog: OnceLock::new() },
     LangInfo { code: "ja", name: "日本語", source: include_str!("ja.tsv"), plural: plural_none, catalog: OnceLock::new() },
+    // Traditional Chinese in the vocabulary used in Taiwan; `zh-TW`, `zh-HK`, `zh-MO` and `zh-Hant-*`
+    // locales all resolve here (see `candidates`).
+    LangInfo { code: "zh-hant", name: "繁體中文", source: include_str!("zh-hant.tsv"), plural: plural_none, catalog: OnceLock::new() },
     LangInfo { code: "cs", name: "Čeština", source: include_str!("cs.tsv"), plural: plural_cs, catalog: OnceLock::new() },
     // Brazilian Portuguese; `pt`, `pt-BR` and `pt-PT` locales all resolve here (see `candidates`).
     LangInfo { code: "pt-br", name: "Português (Brasil)", source: include_str!("pt-br.tsv"), plural: plural_pt, catalog: OnceLock::new() },
@@ -357,7 +360,9 @@ mod tests {
         assert_eq!(lang_from_tag("C"), Some(Lang::EN));
         assert_eq!(lang_from_tag("POSIX"), Some(Lang::EN));
         assert_eq!(lang_from_tag("fr_FR"), None);
-        assert_eq!(lang_from_tag("zh-TW"), None);
+        assert_eq!(lang_from_tag("zh-TW"), Lang::from_code("zh-hant"));
+        assert_eq!(lang_from_tag("zh_HK.UTF-8"), Lang::from_code("zh-hant"));
+        assert_eq!(lang_from_tag("zh-Hant-MO"), Lang::from_code("zh-hant"));
         assert_eq!(lang_from_tag(""), None);
         assert_eq!(lang_from_tag("_"), None);
     }
@@ -648,6 +653,18 @@ mod tests {
         assert_eq!(restored.language, "cs");
     }
 
+    #[test]
+    fn traditional_chinese_is_registered() {
+        let zh = Lang::from_code("zh-hant").expect("zh-hant registered");
+        assert_eq!(zh.name(), "繁體中文");
+        assert_eq!(normalize_pref("zh-Hant"), Some("zh-hant"));
+        assert_eq!(tr(zh, "File"), "檔案");
+        assert_eq!(tr(zh, "報告.pdf"), "報告.pdf");
+        for command in pdfcraft_engine::commands::COMMANDS {
+            assert!(has(zh, command.label), "missing command: {}", command.label);
+        }
+    }
+
     /// Every bundled catalog is well-formed and consistent with its sources.
     #[test]
     fn bundled_catalogs_are_consistent() {

docs/localization.md

@@ -1,8 +1,8 @@
 # Interface language
 
-Choose **Menu > Edit > Preferences…** (Command-comma on macOS, Ctrl-comma elsewhere) **> Interface language** and select **Auto**, **English**, **日本語**, **Čeština** or **Português (Brasil)**. The change applies immediately and persists between launches. Command ids, document contents and file names are unchanged.
+Choose **Menu > Edit > Preferences…** (Command-comma on macOS, Ctrl-comma elsewhere) **> Interface language** and select **Auto**, **English**, **日本語**, **繁體中文**, **Čeština** or **Português (Brasil)**. The change applies immediately and persists between launches. Command ids, document contents and file names are unchanged.
 
-**Auto** (the default) follows the system language: `LC_ALL`, `LC_MESSAGES` or `LANG`, then the preferred-languages list on macOS. Any Portuguese locale (`pt_BR`, `pt_PT`) uses the Brazilian catalog. A system language without a catalog, such as French, shows English. Windows has no system-language detection yet, so **Auto** shows English there unless `LANG` is set.
+**Auto** (the default) follows the system language: `LC_ALL`, `LC_MESSAGES` or `LANG`, then the preferred-languages list on macOS. Any Portuguese locale (`pt_BR`, `pt_PT`) uses the Brazilian catalog, and Chinese locales for Taiwan, Hong Kong and Macau (`zh_TW`, `zh_HK`, `zh_MO`, `zh-Hant`) the Traditional Chinese one. A system language without a catalog, such as French, shows English. Windows has no system-language detection yet, so **Auto** shows English there unless `LANG` is set.
 
 The control channel exposes the setting through `ui.set`:
 
@@ -10,11 +10,11 @@ The control channel exposes the setting through `ui.set`:
 {"method":"ui.set","params":{"key":"language","value":"ja"}}
 ```
 
-The value is `auto` or a language code (`en`, `ja`, `cs`, `pt-br`), in any case. `ui.state` reports `language` as written in the preferences (`auto`, `en`, `ja`, `cs` or `pt-br`). Unknown values return an error without changing the current setting. Preferences saved before this setting existed follow the system language.
+The value is `auto` or a language code (`en`, `ja`, `zh-hant`, `cs`, `pt-br`), in any case. `ui.state` reports `language` as written in the preferences (`auto`, `en`, `ja`, `zh-hant`, `cs` or `pt-br`). Unknown values return an error without changing the current setting. Preferences saved before this setting existed follow the system language.
 
-Dialogs, panels, menus, notices and history labels go through the catalog (`tl!`). Japanese translates them (about 1,800 entries); Czech and Brazilian Portuguese cover the menus so far. Untranslated labels use English. Error details that come from the engine or the operating system are shown as they are, inside a translated frame ("操作「…」に失敗しました: …"). The command palette matches the translated label, the English label and the command id. Vertical Japanese PDF rendering is an existing viewer feature; this change does not add vertical text editing.
+Dialogs, panels, menus, notices and history labels go through the catalog (`tl!`). Japanese and Traditional Chinese translate them (about 1,800 entries each); Czech and Brazilian Portuguese cover the menus so far. Untranslated labels use English. Error details that come from the engine or the operating system are shown as they are, inside a translated frame ("操作「…」に失敗しました: …"). The command palette matches the translated label, the English label and the command id. Vertical Japanese PDF rendering is an existing viewer feature; this change does not add vertical text editing.
 
-Japanese interface text uses BIZ UDPGothic from [craft-fonts](https://github.com/storytold/craft-fonts), an optional build input that every release includes (`CRAFT_FONTS_DIR`; see the README). A build made without it has no Japanese face, so Japanese labels show replacement boxes. Czech and Brazilian Portuguese need only the bundled Latin faces (tested in `tests/fonts.rs`).
+Japanese interface text uses BIZ UDPGothic from [craft-fonts](https://github.com/storytold/craft-fonts), an optional build input that every release includes (`CRAFT_FONTS_DIR`; see the README). A build made without it has no Japanese face, so Japanese labels show replacement boxes. Traditional Chinese is drawn with the same craft-fonts CJK faces, so a character none of them has shows a replacement box (and every Chinese character does in a build without craft-fonts). Czech and Brazilian Portuguese need only the bundled Latin faces (tested in `tests/fonts.rs`).
 
 ## How translations work
 

parity/acrobat-features.toml

@@ -9807,7 +9807,7 @@ status = "partial"
 commands = ["app.preferences"]
 tools = []
 evidence = ["crates/ui-egui/src/i18n/mod.rs::language_persists_and_invalid_input_keeps_current_language", "crates/ui-egui/src/i18n/mod.rs::bundled_catalogs_are_consistent", "crates/ui-egui/src/i18n/mod.rs::japanese_covers_commands_and_catalogue", "crates/ui-egui/tests/control.rs::language_switch_preserves_document_and_command_ids", "crates/ui-egui/tests/control.rs::japanese_controls_and_search_keep_command_ids", "crates/ui-egui/tests/control.rs::japanese_dialogs_errors_and_custom_action_names"]
-notes = "Preferences switches Auto (system language)/English/Japanese/Czech/Brazilian Portuguese and persists; ui.set language auto|en|ja|cs|pt-br and ui.state expose it. TSV catalogs per language (same system as PhotoCraft); every dialog, panel and notice goes through tl!. Japanese covers commands, dialogs, panels, shortcuts and history labels; Czech and Brazilian Portuguese the menus. Engine/OS error details stay untranslated. Missing: the other catalogs filled in, Windows system-language detection, a full localization audit."
+notes = "Preferences switches Auto (system language)/English/Japanese/Traditional Chinese/Czech/Brazilian Portuguese and persists; ui.set language auto|en|ja|zh-hant|cs|pt-br and ui.state expose it. TSV catalogs per language (same system as PhotoCraft); every dialog, panel and notice goes through tl!. Japanese and Traditional Chinese cover commands, dialogs, panels, shortcuts and history labels; Czech and Brazilian Portuguese the menus. Engine/OS error details stay untranslated. Missing: the other catalogs filled in, Windows system-language detection, a full localization audit."
 
 [[feature]]
 id = "misc.prefs-reading"