i18n: Simplified Chinese reads as mainland Chinese, with rows for the strings added since (review of #303)

- Taiwan vocabulary left over from the zh-hant rows #303 started from is
  replaced with the mainland's, about 560 rows: 档案 → 文件, a Taiwan 文件
  (document) → 文档, 工作区域 → 画板, 笔画 → 描边, 色票 → 色板, 遮色片 → 蒙版,
  渐层 → 渐变, 偏好设定 → 首选项, 快速键 → 快捷键, 按一下 → 单击, 描述档 → 配置文件,
  品质 → 质量, 汇出/汇入 → 导出/导入, 连结 → 链接, 点阵 → 栅格, a row 列 → 行,
  「」 → “”, half-width parentheses; tool names that collided or were wrong
  are fixed (Selection Tool 选择工具, Scale Tool 比例缩放工具, Warp 变形,
  Puppet Warp 操控变形, Divide 分割, Exclude 差集, the 直排 type tools).
- 42 rows for strings that landed after #303 (Layers panel, graphics
  processor preference, panel collapse, the font menu's filters).
- A catalog header documenting the format and the vocabulary, and a test
  that zh-hans has no Traditional characters or Taiwan terms.

rows were the better base (hand-adjusted mainland terms in the menus and
dialogs), so no rows were taken from #316.

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

README.md

@@ -255,8 +255,8 @@ Copyright (c) 2026 ArtCraft Team and the VectorCraft contributors. Required noti
 
 Bundled fonts, icons, images and other assets keep their own open licenses; each one is listed
 with its author, source and license in [ASSETS.md](ASSETS.md). Release builds also embed the
-Japanese fonts of [craft-fonts](https://github.com/storytold/craft-fonts/blob/main/ATTRIBUTION.md)
-(SIL Open Font License 1.1).
+fonts of [craft-fonts](https://github.com/storytold/craft-fonts/blob/main/ATTRIBUTION.md) (Japanese,
+Simplified Chinese and Arabic faces; SIL Open Font License 1.1).
 
 The app icon (an engraved dragon on VectorCraft red, `#e8573f`) is the owner's original artwork; its
 palette and files are in [`assets/app-icon/`](assets/app-icon/README.md).

ROADMAP.md

@@ -96,7 +96,7 @@ grade by behaviour against `plan/illustrator/`, not by whether a menu item exist
   - Medium Dark theme, categorized and Advanced toolbars, 35 pt document tabs, 33 pt panel tabs.
   - Hint bar, contextual task bar, 19 dock panels with ≡ menus.
   - The dock's double arrow collapses Properties, Layers and Libraries to icons at the top of the icon column, popping out like the other icon panels, and expands them again (`window.collapseDock`, kept with the preferences and in saved workspaces). The icon column's own arrow (expanding the icon panels into a full column) is not done.
-  - Localised UI: menus (in-window and native), panels, dialogs, toolbar and Preferences read from per-language catalogs (`crates/ui-egui/src/i18n`, see `docs/development.md`); Traditional Chinese (Taiwan) and Japanese ship complete, and Czech and Brazilian Portuguese cover every menu label (and more), with system-locale detection on macOS, Windows and Linux, a VectorCraft ▸ Language menu and a Language preference. Names are never translated (fonts and their styles, layers, artboards, saved presets, user libraries, custom workspaces, recent files, plug-ins).
+  - Localised UI: menus (in-window and native), panels, dialogs, toolbar and Preferences read from per-language catalogs (`crates/ui-egui/src/i18n`, see `docs/development.md`); Traditional Chinese (Taiwan), Simplified Chinese (mainland) and Japanese ship complete, and Czech and Brazilian Portuguese cover every menu label (and more), with system-locale detection on macOS, Windows and Linux, a VectorCraft ▸ Language menu and a Language preference. Names are never translated (fonts and their styles, layers, artboards, saved presets, user libraries, custom workspaces, recent files, plug-ins).
   - Native macOS menu bar, vector tool cursors, a ⌘K command palette, middle-button panning with any tool.
   - A canvas context menu: right-click selects the object under the pointer and lists what applies to the selection (Undo/Redo, clipboard, group, isolation, join, Remove Anchor Points when anchors are selected, masks, compound paths, guides, Transform, Arrange, Select, Export Selection), or the view commands on empty canvas.
   - Save / Don't Save / Cancel before closing or quitting with unsaved documents (tabs, Close, Close All, Quit, window close).
@@ -125,7 +125,7 @@ grade by behaviour against `plan/illustrator/`, not by whether a menu item exist
   - Pathfinder (10 exact curve booleans), Offset, Outline Stroke, Simplify, Clean Up, Split Into Grid, Divide Objects Below. Object › Path › Remove Anchor Points (`path.removeAnchors`) removes the direct-selected anchors without opening their paths (the Delete key still deletes them with their segments): the neighbours keep their handle directions and their facing handles are refitted so one cubic follows the two old segments, and straight sides stay straight. The Delete Anchor Point tool uses the same refit. The Control bar, the contextual task bar, the Properties quick actions and the canvas context menu offer it when anchors are selected.
   - Live effects with previewing dialogs: Distort & Transform, Path, Convert to Shape, 15 Warp styles, Round Corners, Scribble, Effect → Pathfinder (all 10 operations, live on groups; several loose objects are grouped first, in one undo step), Color Adjustments (Brightness/Contrast, Curves, Levels, Hue/Saturation, Shift to Color, Temperature/Tint, on vectors, live type and embedded images), and raster drop shadow, glows and feather. SVG and PDF export keep live effects (geometry baked; SVG raster effects as filters).
 - **Type:** Text Wrap, Type on a Path effects (Rainbow/Skew/3D Ribbon/Stair Step/Gravity), Character and Paragraph Styles (override-preserving redefine), Area Type Options (rows/columns/inset/first baseline), threaded text across any closed shapes, Fit Headline. Area type resizes like Illustrator's type areas: a bounding-box handle drag (Selection tool) or Area Type Options Width/Height size the frame and the text reflows at its size (threads too); Direct Selection drags a frame corner or edge (`text.reshapeArea`). Point type still scales. Variable fonts list every named instance as a style of their family (Figtree Light to Black and their italics, Bahnschrift, Segoe UI Variable), and the instance chosen is shaped, drawn, outlined and measured at its axis settings; PDF and SVG embed it as that instance. Variation axis sliders are not done. Hebrew and Arabic are laid out right to left with the Unicode bidirectional algorithm (embedded Latin and numbers keep their direction, lines put in visual order after wrapping) in point, area and path type, with caret, selection and arrow keys in visual order; each paragraph's direction comes from its first strong character unless Paragraph Direction sets it (Paragraph panel with Show Indic Options, `text.setFormat {direction}`), and new type aligns to the start of its direction. SVG export outlines right-to-left text.
-- **Interface languages, vertical type:** VectorCraft ▸ Language (or Preferences ▸ User Interface) picks Automatic (the system locale) or a registered language, persisted as `interfaceLanguage`. Translations come from per-language catalogs (`i18n/*.tsv`): Traditional Chinese and Japanese cover the whole interface, Czech and Brazilian Portuguese every menu label, Brazilian Portuguese the shell's `tl!` literals too (tested); untranslated text stays English. Japanese and Chinese glyphs come from the craft-fonts build input (release builds) or the installed fonts, Czech ones from the bundled UI fonts. The Basic toolbar's Type button holds Vertical Type in its flyout. Vertical Type, Vertical Area Type and Vertical Type on a Path create vertical text (columns right to left, upright CJK glyphs and marks with `vert` alternates, Latin and longer numbers on their side, two- and three-digit numbers set as tate-chu-yoko in one em of the column (kept whole when justified), upright glyphs centred on the column (tracked or justified too), point type's anchor on the first column's centre line); kinsoku (the strict set) applies to horizontal and vertical Japanese, and justified Japanese lines spread their room between characters (not inside Latin words); Paragraph panel › Mojikumi Set (shown with Preferences › Type › Show East Asian Options, `text.setFormat {mojikumi}`): None or Line-end Punctuation Half Width (new type's default, as in Illustrator; older documents and imported text keep None) shares one half-em space between consecutive punctuation, sets a closing mark ending a line half width, and puts a quarter em between Japanese and Latin letters or digits; Type ▸ Type Orientation switches existing text; caret, selection, hit testing and arrow keys follow the writing direction. Vertical text exports to PDF as real text and to SVG as outlines.
+- **Interface languages, vertical type:** VectorCraft ▸ Language (or Preferences ▸ User Interface) picks Automatic (the system locale) or a registered language, persisted as `interfaceLanguage`. Translations come from per-language catalogs (`i18n/*.tsv`): Traditional and Simplified Chinese and Japanese cover the whole interface, Czech and Brazilian Portuguese every menu label, Brazilian Portuguese the shell's `tl!` literals too (tested); untranslated text stays English. Japanese and Chinese glyphs come from the craft-fonts build input (release builds) or the installed fonts, Czech ones from the bundled UI fonts. The Basic toolbar's Type button holds Vertical Type in its flyout. Vertical Type, Vertical Area Type and Vertical Type on a Path create vertical text (columns right to left, upright CJK glyphs and marks with `vert` alternates, Latin and longer numbers on their side, two- and three-digit numbers set as tate-chu-yoko in one em of the column (kept whole when justified), upright glyphs centred on the column (tracked or justified too), point type's anchor on the first column's centre line); kinsoku (the strict set) applies to horizontal and vertical Japanese, and justified Japanese lines spread their room between characters (not inside Latin words); Paragraph panel › Mojikumi Set (shown with Preferences › Type › Show East Asian Options, `text.setFormat {mojikumi}`): None or Line-end Punctuation Half Width (new type's default, as in Illustrator; older documents and imported text keep None) shares one half-em space between consecutive punctuation, sets a closing mark ending a line half width, and puts a quarter em between Japanese and Latin letters or digits; Type ▸ Type Orientation switches existing text; caret, selection, hit testing and arrow keys follow the writing direction. Vertical text exports to PDF as real text and to SVG as outlines.
 - **Transparency:** opacity masks (clip/invert/disable/link), exported as SVG `<mask>` and PDF soft masks.
 - **Advanced art:** live Blends (steps/distance/smooth colour, editable spine, anchor-targeted Blend tool, faithful interpolation, knockout), Envelope Distort (warp/mesh/top object, Reset, full Envelope Options, mesh handles, Edit Contents; type, images, symbols, gradients, patterns and appearance distorted everywhere), Liquify tools with options and pen pressure, Puppet Warp with rotating pins, Perspective Grid with presets, movable planes and projected type (choosing a perspective tool shows the grid; Hide Grid hides it with the tool still chosen), Gradient Mesh, Shape Builder, Live Paint (every path an edge, open lines included), Image Trace (12 presets), pattern swatches with pattern editing mode, live Repeat (radial/grid/mirror).
 - **Paint and appearance (M3):**

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

@@ -88,6 +88,8 @@ pub static LANGUAGES: [LangInfo; 6] = [
         complete_menus: true,
         catalog: OnceLock::new(),
     },
+    // Simplified Chinese in the vocabulary used in mainland China; `zh-CN`, `zh-SG`, `zh-Hans-*` and a
+    // bare `zh` resolve here (see `candidates`).
     LangInfo {
         code: "zh-hans",
         name: "简体中文",

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

@@ -247,6 +247,67 @@ fn zh_hant_has_no_simplified_characters() {
     assert!(bad.is_empty(), "simplified characters in zh-hant.tsv:\n{}", bad.join("\n"));
 }
 
+/// The Simplified Chinese catalog is written in Simplified characters and in the vocabulary of the
+/// mainland: Taiwan's terms (and a converted Traditional row) would read as foreign to its users.
+#[test]
+fn zh_hans_is_simplified_and_mainland() {
+    const TRADITIONAL_ONLY: &str = "們這為來時間個說對會發現過還沒動開關圖層選設項編輯顯視幫刪預覽導節線連擇報錯誤處據庫經體應該樣點擊確認標記錄輸進轉換調約維護啟閉鎖義類網絡頁顏繪畫寬長邊緣縮鏡複貼漸濾筆鋼區飽參數變號單雙屬組齊徑錨輪陰陽實際讓從產東車門問閃並堅測試運術壓縮疊飾夠亞質紙張檔認識";
+    const TAIWAN_TERMS: &[&str] = &[
+        "档案",
+        "资料夹",
+        "快速键",
+        "按一下",
+        "按两下",
+        "描述档",
+        "品质",
+        "贴上",
+        "功能表",
+        "物件",
+        "工作区域",
+        "遮色片",
+        "影像",
+        "列印",
+        "印表机",
+        "字型",
+        "视窗",
+        "滑鼠",
+        "游标",
+        "程式",
+        "软体",
+        "偏好设定",
+        "色票",
+        "渐层",
+        "笔刷",
+        "尺标",
+        "字元",
+        "汇出",
+        "汇入",
+        "连结",
+        "解析度",
+        "点阵图",
+        "介面",
+        "自订",
+        "对话方块",
+        "预设值",
+        "储存",
+        "套用",
+        "「",
+        "」",
+    ];
+    let lang = Lang::from_code("zh-hans").expect("zh-hans registered");
+    let (entries, _) = parse_entries(lang.0.source);
+    let mut bad = Vec::new();
+    for (ctx, src, tr) in entries {
+        if let Some(c) = tr.chars().find(|c| TRADITIONAL_ONLY.contains(*c)) {
+            bad.push(format!("{ctx} {src:?} → {tr:?} has {c:?}"));
+        }
+        if let Some(w) = TAIWAN_TERMS.iter().find(|w| tr.contains(**w)) {
+            bad.push(format!("{ctx} {src:?} → {tr:?} has the Taiwan term {w:?}"));
+        }
+    }
+    assert!(bad.is_empty(), "in zh-hans.tsv:\n{}", bad.join("\n"));
+}
+
 /// Every menu string (top-level titles, submenu names, item labels, section headers, UI and
 /// engine command labels and menu paths) has an entry in each language that claims complete menus.
 #[test]

docs/development.md

@@ -74,12 +74,10 @@ text at render time from one catalog per language (`i18n/<code>.tsv`; the format
 always use the English ids and labels, so agents and scripts never see translated text.
 
 Languages shipped: English (`en`, the source), Traditional Chinese (`zh-hant`, complete, in the vocabulary used
-in Taiwan; `zh-TW`, `zh-HK`, `zh-MO` and `zh-Hant-*` locales all resolve to it), Japanese (`ja`, complete),
-Czech (`cs`, every menu label) and Brazilian Portuguese (`pt-br`, every menu label and every `tl!` literal).
-Untranslated text falls back to English until its rows are
-added. Simplified Chinese locales
-(`zh-CN`, `zh-SG`, `zh-Hans`) fall back to English until a `zh-hans` catalog is registered: the resolver already
-tells the two scripts apart, so the Traditional catalog is never shown to a Simplified locale.
+in Taiwan; `zh-TW`, `zh-HK`, `zh-MO` and `zh-Hant-*` locales all resolve to it), Simplified Chinese (`zh-hans`,
+complete, in the vocabulary used in mainland China; `zh-CN`, `zh-SG`, `zh-Hans-*` and a bare `zh` resolve to it,
+so the two scripts never mix), Japanese (`ja`, complete), Czech (`cs`, every menu label) and Brazilian Portuguese
+(`pt-br`, every menu label and every `tl!` literal). Untranslated text falls back to English until its rows are added.
 
 - `tl!("…")` translates a literal into the language the UI is drawn in; `i18n::t(s)` is the same for a
   `&str`. `tr(lang, s)` takes the language; `tr_ctx` when one English word needs different translations;