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pdfcraft/docs/localization-parity.md
Brandon ThomasandClaude Opus 5.5 798650e8a0 Progress docs: target-app parity, gaps, alpha gate, readiness by audience (#873)
Progress docs per craftrules standards/progress-docs.md: target-app parity, gaps, roadmap with alpha gate, readiness by audience (full / mainstream / essentials) with Opus 5.5 hours, and feature, format, PDF-spec, hardware, UI and localization parity docs.

Co-Authored-By: Claude Opus 5.5 <[email protected]>
2026-10-10 14:23:28 -04:00

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Localization parity

Last reviewed: 2026-10-10 · Last updated: 2026-10-10 · Change: major (first per-language status, measured from the catalogs) · Target: Adobe Acrobat Pro (Acrobat DC, continuous track 26.002.21931, macOS)

Per-language status of PdfCraft's interface against Acrobat Pro's. How translations work and how to add a language: localization.md. Summary in ROADMAP.md.

How this was measured

  • Strings translated is measured: the catalogs in crates/ui-egui/src/i18n/<code>.tsv, counted as distinct (context, English) keys with a non-empty translation. The denominator is the union of keys across all catalogs, 2,143. Cross-check: of the 1,151 distinct tl!("…") literals in crates/ui-egui/src, every full catalog covers 96.5–99.4% (7 literals are in no catalog yet). English is built in.
  • Not counted: error details from the engine and the operating system, which are shown in English inside a translated frame; there is no translated user documentation or help yet (Acrobat ships localized help).
  • Script support comes from localization.md, the vendored winit IME patches (vendor/README.md) and user reports.
  • Native review: "community" means a native speaker contributed or corrected the catalog in a pull request or issue; "no" means no record of review. No catalog has had a formal review.
  • Acrobat ships 24 interface localizations on macOS (.lproj: cs, da, de, en, es, fi, fr, hu, it, ja, ko, nl, no, pl, pt, ru, sv, tr, uk, zh_CN, zh_TW, plus en_AE, en_IL, fr_MA) and Middle East / North Africa editions (MEA Arabic, MEH Hebrew, NAF French; Resources/Sequences/).

The twelve key languages

Language Code UI strings translated Dialogs / tooltips / help Script support Native review Status Acrobat ships it To full (h)
English en built in (100%) all; README and docs Latin yes full yes 0
Simplified Chinese zh-hans 2,088 (97.4%) dialogs and tooltips through tl!; no help CJK text and IME work, but release builds have no Hans face: many characters show as boxes (#826, #688, #728, #758; Flatpak #689) no partial yes 6–12
Spanish es 2,046 (95.5%) dialogs and tooltips; no help Latin no partial yes 2–4
Hindi hi 0 none Devanagari not tested (egui shapes Telugu conjuncts, so shaping is likely workable); no Devanagari face in craft-fonts no none no 10–18
Arabic ar 2,143 (100%) dialogs and tooltips; no help Letters joined and lines reordered at load, but layout not mirrored, wrapped lines break at the wrong end, typed text runs left to right (localization.md §Arabic) no partial yes (Middle East edition) 25–45
French fr 2,128 (99.3%) dialogs and tooltips; no help Latin no partial yes 1–2
Portuguese (Brazil) pt-br 2,130 (99.4%) dialogs and tooltips; no help Latin community (#288) partial yes 1–2
Indonesian id 0 none Latin no none no 3–5
Japanese ja 2,123 (99.1%) dialogs and tooltips; no help BIZ UDPGothic from craft-fonts; IME patched on macOS, Windows, X11, Wayland; vertical text renders but can't be edited no partial yes 4–8
German de 2,128 (99.3%) dialogs and tooltips; no help Latin community, in progress (#828: terminology, clipping) partial yes 2–4
Korean ko 0 none Hangul IME patched (Microsoft and Apple Korean, vendor/README.md winit 3, 6, 9, 10); no Hangul UI face in craft-fonts no none yes 6–10
Vietnamese vi 0 none Latin with stacked diacritics; bundled Inter covers them (not tested) no none no 3–5

Localization dimension ≈ 59%: the mean over the twelve, counting a catalog's percentage but only 60% for Chinese and Arabic until their script problems are fixed, and 0 for the four missing languages. ≈ 60–115 h to bring all twelve to full, of which ≈ 35–60 h is engineering (Hans face, RTL layout, bidi text) and the rest catalogs and fixes; native-speaker review needs humans.

No language is full except English: every catalog leaves engine error details in English, and none has translated help.

Other shipped languages

Language Code UI strings translated Status Acrobat ships it
Traditional Chinese zh-hant 2,016 (94.1%) partial (same Hans/Hant face caveat) yes
Russian ru 2,043 (95.3%) partial yes
Bulgarian bg 2,094 (97.7%) partial no
Czech cs 135 (6.3%) menus only yes
Telugu te 2,058 (96.0%) partial (the release-pinned craft-fonts has no Telugu face yet) no
Hungarian hu 2,126 (99.2%) partial yes
Ukrainian uk 2,142 (100%) partial yes
Italian it 2,130 (99.4%) partial yes

8 other languages ship (15 catalogs plus English, 16 interface languages in Preferences). Acrobat languages PdfCraft lacks: Danish, Dutch, Finnish, Norwegian, Polish, Swedish, Turkish, Hebrew.

Revision history

Date Change Summary
2026-10-10 major Created. Catalog counts measured from crates/ui-egui/src/i18n/*.tsv against the 2,143-key union; Acrobat's localizations from its bundle's .lproj and Sequences folder names