Strings in code stay English and are the lookup keys; `crates/ui-egui/src/i18n`
maps them to display text at render time from one `*.tsv` catalog per language
(`LANGUAGES` registry, `tl!`/`t`/`tr`/`tr_ctx`/`tr_id`/`tn`/`fmt`). Command ids,
menu paths, `ui.menu.list`, the control channel, the CLI, MCP, status messages
and undo labels never see translated text, so agents, scripts and the existing
tests are unaffected (under `cargo test` the UI is always English).
Wired: in-window menus and the macOS native menu (rebuilt on a language change),
dynamic labels (Undo X, Reset X, Last Effect: X as templates), the command
palette (matches English and translated text), dock tabs, panel tooltips, the
toolbar (category names now cut by characters, not bytes), the dialog frame, the
shared widgets, the Preferences dialog, the shortcut editor, the hint and status
bars, the Home screen, and the literals of every panel and dialog.
Preference `interfaceLanguage` (User Interface › Language): `auto` or a code.
`auto` follows `VECTORCRAFT_LOCALE`, `LC_ALL`/`LC_MESSAGES`/`LANG`/`LANGUAGE`,
the macOS preferred languages and, on Windows (which sets no `LANG`), the user
locale from `HKCU\Control Panel\International`. `zh-TW`/`zh-HK`/`zh-MO`/
`zh-Hant-*` resolve to `zh-hant`; Simplified locales stay English until a
`zh-hans` catalog exists.
`zh-hant.tsv` (~2,850 rows) is clean-room, in the vocabulary used in Taiwan;
terms shared with PhotoCraft reuse its wording, vector terms use everyday
vector-drawing vocabulary. Tests: catalog well-formedness (placeholders,
ellipses, command ids, no Simplified characters), locale resolution, and two
coverage tests that fail when a menu string, panel/tool/preference label,
dialog button, hint-bar fragment or `tl!` literal has no row in a language
marked `complete_menus`. `VECTORCRAFT_I18N_DUMP=file cargo test -p
vectorcraft-ui-egui dump_source_strings` lists the strings for translators.
Also: two clippy findings under rustc 1.97 fixed in passing.
Integrated with main (squashed onto it, 42 commits on): the Czech interface
(#213) moves from its Rust table to `i18n/cs.tsv` on the registry (all 556
rows, Czech plural rule, its menu-coverage and glyph tests kept); Find Font's
resolution notes and the canvas context menu's labels are translated and
covered by the catalog tests (`menus::CONTEXT_LABELS`); the glyph test checks
CJK text only when the craft-fonts build input is embedded (#220 moved the
Japanese fonts out of this repository); a language saved by an older version
carries over to `interfaceLanguage`; Windows' locale lookup runs reg.exe by its
full path.
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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