pdfcraft/docs/localization-parity.md

# Localization parity

> **Last reviewed:** 2026-10-21 · **Last updated:** 2026-10-21 · **Change:** minor (Brazilian Portuguese now covers the 2,674-key catalog union; twelve-language mean still rounds to ≈68%; Spanish 100% of the current key union) · **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](localization.md). Summary in [ROADMAP.md](../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, counting language-specific context rows such as `theme`/`Appearance`.
  **That union is a moving target**: every change that adds a string widens it, so a count is only
  comparable with others measured on the same date, and a catalog that reached 100% falls behind
  without losing a single translation. Every figure here therefore carries its date. The current
  union is **2,674** keys as of 2026-10-20, against the **2,143-key snapshot** of 2026-10-10; earlier
  revisions quote the union of their own date (see the revision history), not this one. The
  twelve-language percentage table below still quotes the 2026-10-10 snapshot for every language
  except Spanish, Vietnamese, Lithuanian and Brazilian Portuguese, which are measured against the current union. 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](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` | 2,674 (100% of current key union) | 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` | 2,674 (100% of current union) | 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` | 2,674 (100% of current key union) | dialogs and tooltips; no help | Latin with stacked diacritics; bundled Inter covers them (fonts test) | community | partial | no | 2–4 |

**Localization dimension ≈ 68%**: 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 Hindi, Indonesian and
Korean (still missing). Vietnamese moved from 0% to 100% in that mean (59% → 68%). **≈ 55–110 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. The **To `full`** hours of Vietnamese and Spanish are therefore residual
help/docs polish (catalog and script work are already done), not missing UI strings.

## 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` | 2,674 entries (every key of the other catalogs, the engine's sentences, weekdays and certificate fields) | partial | 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` | 2,528 entries (every key of the other catalogs that the code looks up) | partial | yes |
| Kazakh | `kk` | 2,327 entries | partial | no |
| Polish | `pl` | 2,287 entries | partial | yes |
| Slovenian | `sl` | 2,324 entries | partial | no |
| Greek | `el` | 2,341 entries | partial | no |
| Turkish | `tr` | 2,313 entries | partial | yes |
| Lithuanian | `lt` | 2,674 (100% of current key union) | partial; community native-speaker review ([#1401](https://github.com/storytold/pdfcraft/pull/1401)) | no |
| Finnish | `fi` | 2,674 entries | partial; AI-assisted, native proofreading pending | yes |
| Albanian | `sq` | 2,344 entries | partial; not yet reviewed by a native speaker | no |
| Catalan | `ca` | 2,592 entries | partial: no translated help, engine error details in English; native-speaker review by the contributor | no |
| Romanian | `ro` | 2,673 entries (every bundled key) | partial; AI-assisted, not yet reviewed line by line by a native speaker | no |
| Norwegian Bokmål | `nb` | 2,674 entries | partial; native-speaker terminology review by the contributor ([#1836](https://github.com/storytold/pdfcraft/pull/1836)), not yet line by line | yes |

**19 other languages** ship (33 catalogs plus English = **34** interface languages in Preferences).
The entry counts without percentages were measured on 2026-10-12–14 (Norwegian Bokmål on 2026-10-18); they are not percentages of the older 2,143-key snapshot above. Their presence does not imply a detailed linguistic or runtime review.
Acrobat languages PdfCraft lacks: Danish, Dutch, Swedish, Hebrew. Vietnamese is shipped here but not by Acrobat.

## Revision history

| Date | Change | Summary |
|---|---|---|
| 2026-10-21 | minor | Brazilian Portuguese (`pt-br`) now covers all 2,674 distinct keys in the current catalog union; no help or engine/OS error-detail localization; twelve-language mean still rounds to ≈ 68% |
| 2026-10-20 | minor | Spanish: the 143 keys the other catalogs had and `es.tsv` was missing; `es` now covers the whole 2,674-key union, like `lt` and `vi`. Restated Lithuanian against the current union (its 2,585 was measured on 2026-10-13) and said plainly in *How this was measured* that the union moves, so counts only compare within a date |
| 2026-10-19 | minor | Removed the 2026-10-13 status line and the 14-language summary that concurrent merges left beside the current ones; the summary keeps the Italian and Norwegian Bokmål measurement dates |
| 2026-10-16 | minor | Czech: 2,674 entries after adding the keys the other catalogs had (the engine's sentences, weekday heads, certificate fields, shared buttons) and unifying "tag" as *tag* (not *značka*, which is a redaction mark) |
| 2026-10-13 | minor | Vietnamese (`vi`) catalog: 2,591 entries (100% of current key union + `theme`/`Appearance`); twelve-language mean ≈ 68%; native-speaker community review; registered with `plural_none` |
| 2026-10-14 | minor | Italian: 2,528 entries after adding the 201 keys the other catalogs had and the code looks up |
| 2026-10-14 | minor | Added Finnish (2,674 entries, AI-assisted) |
| 2026-10-12 | minor | Added Albanian (`sq`): catalog, date names, Preferences entry |
| 2026-10-14 | minor | Added Catalan (`ca`, 2,592 entries, measured 2026-10-14); retained existing language assessments |
| 2026-10-15 | minor | Romanian (`ro`) catalog: 2,673 entries (every bundled key); three plural forms (`plural_ro`); not one of the twelve key languages, so the mean is unchanged |
| 2026-10-15 | minor | Norwegian Bokmål added as an interface and date language with a 2,674-entry catalog |
| 2026-10-12 | minor | Added current counts for Kazakh, Polish, Slovenian, Greek, Turkish and Lithuanian; retained existing language assessments and the original percentage snapshot |
| 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 |