feat(i18n): add complete Turkish interface language support (#1057)

* feat(i18n): add complete Turkish interface language support

* Turkish: rows for the labels that landed alongside this catalog; refresh hashes

---------

Co-authored-by: Brandon Thomas <[email protected]>

ATTRIBUTION.md

@@ -4,7 +4,7 @@
 
 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 (268)
+## In this repository (269)
 
 | Asset | Title | Author | Licence | Source | Used for |
 |---|---|---|---|---|---|
@@ -26,6 +26,7 @@ Every asset PdfCraft includes, bundles or uses to build its published material,
 | `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 |
 | `crates/ui-egui/src/i18n/uk.tsv` | Ukrainian 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 | Ukrainian UI strings, compiled in by crates/ui-egui/src/i18n/mod.rs |
 | `crates/ui-egui/src/i18n/ar.tsv` | Arabic 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 | Arabic UI strings, compiled in by crates/ui-egui/src/i18n/mod.rs |
+| `crates/ui-egui/src/i18n/tr.tsv` | Turkish 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 | Turkish UI strings, compiled in by crates/ui-egui/src/i18n/mod.rs |
 | `assets/icons/accessibility.svg` | Lucide icon "accessibility" | Lucide Contributors (portions Cole Bemis, Feather) | ISC | https://github.com/lucide-icons/lucide (npm lucide-static 1.49.0, icons/accessibility.svg) | UI icon, embedded via crates/ui-egui/src/icon_data.rs |
 | `assets/icons/align-left.svg` | Lucide icon "align-left" | Lucide Contributors (portions Cole Bemis, Feather) | ISC | https://github.com/lucide-icons/lucide (npm lucide-static 1.49.0, icons/align-left.svg) | UI icon, embedded via crates/ui-egui/src/icon_data.rs |
 | `assets/icons/align-center.svg` | Lucide icon "align-center" | Lucide Contributors (portions Cole Bemis, Feather) | ISC | https://github.com/lucide-icons/lucide (npm lucide-static 1.49.0, icons/align-center.svg) | UI icon, embedded via crates/ui-egui/src/icon_data.rs |

ATTRIBUTION.toml

@@ -208,6 +208,17 @@ kind = "translation"
 usage = "Arabic UI strings, compiled in by crates/ui-egui/src/i18n/mod.rs"
 sha256 = "a8a66390b2d80b4708c4f854318b923eef7f0f5932439fb5ef25f2651980f24e"
 
+[[asset]]
+path = "crates/ui-egui/src/i18n/tr.tsv"
+title = "Turkish 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 = "Turkish UI strings, compiled in by crates/ui-egui/src/i18n/mod.rs"
+sha256 = "5688538845a80c154feabd096badbf097485dea8a7402fede4ef7d71466e9d6a"
+
 [[asset]]
 path = "assets/icons/accessibility.svg"
 title = "Lucide icon \"accessibility\""

crates/engine/src/dates.rs

@@ -56,7 +56,7 @@ const AR_DAYS: [&str; 7] = ["الأحد", "الاثنين", "الثلاثاء",
 
 /// The languages month and weekday names can be written in (Preferences ▸ Date format ▸ Language):
 /// the interface languages, in the same order and with the same names.
-pub const DATE_LANGUAGES: [DateLanguage; 20] = [
+pub const DATE_LANGUAGES: [DateLanguage; 21] = [
     DateLanguage {
         code: "en",
         name: "English",
@@ -303,6 +303,15 @@ pub const DATE_LANGUAGES: [DateLanguage; 20] = [
         days: ["Κυριακή", "Δευτέρα", "Τρίτη", "Τετάρτη", "Πέμπτη", "Παρασκευή", "Σάββατο"],
         days_short: ["Κυρ", "Δευ", "Τρί", "Τετ", "Πέμ", "Παρ", "Σάβ"],
     },
+    DateLanguage {
+        code: "tr",
+        name: "Türkçe",
+        months: ["Ocak", "Şubat", "Mart", "Nisan", "Mayıs", "Haziran", "Temmuz", "Ağustos", "Eylül", "Ekim", "Kasım", "Aralık"],
+        months_with_day: None,
+        months_short: ["Oca", "Şub", "Mar", "Nis", "May", "Haz", "Tem", "Ağu", "Eyl", "Eki", "Kas", "Ara"],
+        days: ["Pazar", "Pazartesi", "Salı", "Çarşamba", "Perşembe", "Cuma", "Cumartesi"],
+        days_short: ["Paz", "Pzt", "Sal", "Çar", "Per", "Cum", "Cmt"],
+    },
 ];
 
 /// The date language for `code` (any case), or `None` when there's none.

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

@@ -136,7 +136,7 @@ fn plural_sl(n: u64) -> usize {
 }
 
 /// The registry. English first: it is the fallback and the source language.
-pub static LANGUAGES: [LangInfo; 20] = [
+pub static LANGUAGES: [LangInfo; 21] = [
     LangInfo { code: "en", name: "English", source: "", plural: plural_one_other, rtl: false, catalog: OnceLock::new() },
     LangInfo { code: "ja", name: "日本語", source: include_str!("ja.tsv"), plural: plural_none, rtl: false, catalog: OnceLock::new() },
     // Simplified Chinese; `zh`, `zh-CN`, `zh-SG` and `zh-Hans-*` locales resolve here (see `candidates`).
@@ -192,6 +192,8 @@ pub static LANGUAGES: [LangInfo; 20] = [
     // Slovene; every `sl-*` locale (`sl-SI`) resolves here. Four plural forms (one, two, few, other).
     LangInfo { code: "sl", name: "Slovenščina", source: include_str!("sl.tsv"), plural: plural_sl, rtl: false, catalog: OnceLock::new() },
     LangInfo { code: "el", name: "Ελληνικά", source: include_str!("el.tsv"), plural: plural_one_other, rtl: false, catalog: OnceLock::new() },
+    // Turkish; every `tr-*` locale (`tr-TR`, `tr_TR.UTF-8`) resolves here.
+    LangInfo { code: "tr", name: "Türkçe", source: include_str!("tr.tsv"), plural: plural_none, rtl: false, catalog: OnceLock::new() },
 ];
 
 impl LangInfo {
@@ -841,7 +843,7 @@ mod tests {
             labels.insert(label.to_string());
         }
         assert!(labels.len() > 20 && labels.contains("Comb of characters"), "the scan found the dialog's labels: {labels:?}");
-        for code in ["bg", "cs", "de", "es", "fr", "hu", "it", "ja", "pt-br", "ru", "te", "uk", "zh-hans", "zh-hant"] {
+        for code in ["bg", "cs", "de", "es", "fr", "hu", "it", "ja", "pt-br", "ru", "te", "tr", "uk", "zh-hans", "zh-hant"] {
             let lang = Lang::from_code(code).expect("registered");
             let missing: Vec<_> = labels.iter().filter(|l| !has(lang, l)).collect();
             assert!(missing.is_empty(), "{code} lacks Shared Field Properties labels: {missing:#?}");
@@ -1391,6 +1393,95 @@ mod tests {
         set_current(Lang::EN);
     }
 
+    /// Turkish covers every registered menu title and menu command label, keeps ellipses, and
+    /// persists in preferences.
+    #[test]
+    fn turkish_covers_every_menu_label() {
+        let tr_lang = Lang::from_code("tr").expect("tr registered");
+        assert_eq!(tr_lang.name(), "Türkçe");
+        assert_eq!(tr(tr_lang, "File"), "Dosya");
+        assert_eq!(tr(tr_lang, "Türkçe Belge.pdf"), "Türkçe Belge.pdf");
+        assert_eq!((0..=6).map(|n| (tr_lang.0.plural)(n)).collect::<Vec<_>>(), [0; 7]);
+        for spec in pdfcraft_engine::commands::COMMANDS {
+            let Some(menu) = spec.menu else { continue };
+            assert!(has(tr_lang, menu), "Turkish lacks the menu title {menu:?}");
+            assert!(has(tr_lang, spec.label), "Turkish lacks the {menu} menu label {:?} ({})", spec.label, spec.id);
+        }
+        const KEEP_AS_IS: &[&str] = &[
+            "OK",
+            "PDF/A…",
+            "Microsoft Word (.docx)",
+            "PostScript / EPS",
+            "Preflight",
+            "JavaScript",
+            "ZIP",
+            "{n} {kind}",
+            "{rule} - {status}",
+            "Poster",
+            "{field}: {e}",
+            "`{command}` {when}",
+            "{0}: {1}",
+            "{month} {y}",
+            "+LOC",
+            "−LOC",
+            "ΔLOC",
+            "+Bin",
+            "−Bin",
+            "Model",
+            "Home / End",
+        ];
+        let (entries, errors) = parse_entries(tr_lang.0.source, tr_lang.0.plural_forms());
+        assert!(errors.is_empty(), "Turkish catalog errors: {errors:?}");
+        for e in &entries {
+            assert!(
+                e.source != e.translation || KEEP_AS_IS.contains(&e.source.as_str()) || (e.context == "key" && KEY_CAP_NAMES.contains(&e.source.as_str())),
+                "{:?} is untranslated",
+                e.source
+            );
+            assert!(!e.translation.contains("..."), "use … rather than three dots: {:?}", e.translation);
+            assert_eq!(e.source.starts_with(' '), e.translation.starts_with(' '), "leading space mismatch: {:?}", e.translation);
+            assert_eq!(e.source.ends_with(' '), e.translation.ends_with(' '), "trailing space mismatch: {:?}", e.translation);
+        }
+        let mut app = crate::PdfCraftApp::default();
+        app.set_option("language", "tr").unwrap();
+        assert!(app.set_option("language", "tu").is_err());
+        assert_eq!(app.language, "tr");
+        let mut restored = crate::PdfCraftApp::default();
+        restored.restore(&app.persist());
+        assert_eq!(restored.language, "tr");
+    }
+
+    /// Turkish translates every registered command, menu and All tools label.
+    #[test]
+    fn turkish_covers_commands_and_catalogue() {
+        let tr_lang = Lang::from_code("tr").expect("tr registered");
+        for command in pdfcraft_engine::commands::COMMANDS {
+            assert!(has(tr_lang, command.label), "missing command: {}", command.label);
+            if let Some(menu) = command.menu {
+                assert!(has(tr_lang, menu), "missing menu: {menu}");
+            }
+        }
+        for group in pdfcraft_engine::catalog::TOOL_GROUPS {
+            assert!(has(tr_lang, group.label), "missing group: {}", group.label);
+            for section in group.sections {
+                assert!(has(tr_lang, section.title), "missing section: {}", section.title);
+                for item in section.items {
+                    assert!(has(tr_lang, item.label), "missing item: {}", item.label);
+                }
+            }
+        }
+    }
+
+    /// Turkish translates every `tl!("…")` literal in the UI source.
+    #[test]
+    fn turkish_covers_ui_literals() {
+        let literals = ui_literals();
+        assert!(literals.len() > 900, "source scan found only {} literals", literals.len());
+        let tr_lang = Lang::from_code("tr").expect("tr registered");
+        let missing: Vec<_> = literals.iter().filter(|label| !has(tr_lang, label)).collect();
+        assert!(missing.is_empty(), "untranslated Turkish UI literals: {missing:#?}");
+    }
+
     #[test]
     fn simplified_chinese_is_registered() {
         let zh = Lang::from_code("zh-hans").expect("zh-hans registered");

crates/ui-egui/tests/fonts.rs

@@ -238,6 +238,7 @@ fn primary_ui_fonts_cover_latin_and_cyrillic_catalogs() {
         ("hu", include_str!("../src/i18n/hu.tsv")),
         ("uk", include_str!("../src/i18n/uk.tsv")),
         ("it", include_str!("../src/i18n/it.tsv")),
+        ("tr", include_str!("../src/i18n/tr.tsv")),
         ("sl", include_str!("../src/i18n/sl.tsv")),
     ] {
         let mut text = String::from("áčďéěíňóřšťúůýžÁČĎÉĚÍŇÓŘŠŤÚŮÝŽãõçâêôàÃÕÇÂÊÔÀñÑüÜäÄöÖőűß„“¿¡«»…ґҐєЄіІїЇәғқңөұүһӘҒҚҢӨҰҮҺ");

docs/localization.md

@@ -1,9 +1,11 @@
 # Interface language
 
+Choose **Menu > Edit > Preferences…** (Command-comma on macOS, Ctrl-comma elsewhere) **> Interface language** and select **Auto**, **English**, **日本語**, **简体中文**, **繁體中文**, **Русский**, **Български**, **Čeština**, **Português (Brasil)**, **Deutsch**, **Español**, **Français**, **తెలుగు**, **Magyar**, **Українська**, **Italiano**, **العربية** or **Türkçe**. 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**, **简体中文**, **繁體中文**, **Русский**, **Български**, **Čeština**, **Português (Brasil)**, **Deutsch**, **Español**, **Français**, **తెలుగు**, **Magyar**, **Українська**, **Italiano**, **العربية** or **Slovenščina**. The change applies immediately and persists between launches. Command ids, document contents and file names are unchanged.
 
 Displayed keyboard shortcuts use the same active interface language. For example, German shows `Strg+K` and `Strg+Umschalt+S` in the toolbar, menus, command palette, tooltips and Keyboard shortcuts dialog; macOS keeps its modifier symbols (`⌘`, `⇧`, `⌃`). Key names have their own `key` catalog context, so the Delete key can read `Entf` while the command remains `Löschen`. A missing key-name entry falls back to the English key name. Actual bindings and machine-facing command ids remain stable.
 
+**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, any French locale (`fr`, `fr_FR`, `fr_CA`, `fr_BE`) the French one, any German locale (`de`, `de_DE`, `de_AT`, `de_CH`) the German one, and Chinese locales for Taiwan, Hong Kong and Macau (`zh_TW`, `zh_HK`, `zh_MO`, `zh-Hant`) the Traditional Chinese one; other Chinese locales (`zh`, `zh_CN`, `zh_SG`, `zh-Hans`) the Simplified Chinese one. Telugu locales (`te`, `te_IN`) use the Telugu catalog, Bulgarian locales (`bg`, `bg_BG`) the Bulgarian one, and Hungarian locales (`hu`, `hu_HU`) the Hungarian one, and Ukrainian locales (`uk`, `uk_UA`) the Ukrainian one, and Italian locales (`it`, `it_IT`, `it_CH`) the Italian one, and Arabic locales (`ar`, `ar_MA`, `ar_EG`, `ar_SA`, …) the Arabic one, and Turkish locales (`tr`, `tr_TR`) the Turkish one. A system language without a catalog shows English. On Windows, **Auto** uses the Windows display languages, in preference order, when no supported locale is selected by those environment variables. Neutral `C`/`POSIX` locale values (including `C.UTF-8`) inherited from a launcher do not override the Windows display language; explicitly named supported locales such as `fr_FR.UTF-8` still do. The query asks Windows directly (`GetUserPreferredUILanguages`, through the `sys-locale` crate) without starting a process, and is cached for the process. If detection fails or the display language has no catalog, PdfCraft shows English.
 **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, any French locale (`fr`, `fr_FR`, `fr_CA`, `fr_BE`) the French one, any German locale (`de`, `de_DE`, `de_AT`, `de_CH`) the German one, and Chinese locales for Taiwan, Hong Kong and Macau (`zh_TW`, `zh_HK`, `zh_MO`, `zh-Hant`) the Traditional Chinese one; other Chinese locales (`zh`, `zh_CN`, `zh_SG`, `zh-Hans`) the Simplified Chinese one. Telugu locales (`te`, `te_IN`) use the Telugu catalog, Bulgarian locales (`bg`, `bg_BG`) the Bulgarian one, and Hungarian locales (`hu`, `hu_HU`) the Hungarian one, and Ukrainian locales (`uk`, `uk_UA`) the Ukrainian one, and Italian locales (`it`, `it_IT`, `it_CH`) the Italian one, and Arabic locales (`ar`, `ar_MA`, `ar_EG`, `ar_SA`, …) the Arabic one, and Slovenian locales (`sl`, `sl_SI`) the Slovenian one. A system language without a catalog shows English. On Windows, **Auto** uses the Windows display languages, in preference order, when no supported locale is selected by those environment variables. Neutral `C`/`POSIX` locale values (including `C.UTF-8`) inherited from a launcher do not override the Windows display language; explicitly named supported locales such as `fr_FR.UTF-8` still do. The query asks Windows directly (`GetUserPreferredUILanguages`, through the `sys-locale` crate) without starting a process, and is cached for the process. If detection fails or the display language has no catalog, PdfCraft shows English.
 
 The control channel exposes the setting through `ui.set`:
@@ -12,14 +14,16 @@ 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`, `zh-hans`, `zh-hant`, `ru`, `bg`, `cs`, `pt-br`, `de`, `es`, `fr`, `te`, `hu`, `uk`, `it`, `ar`), in any case. `ui.state` reports `language` as written in the preferences (`auto`, `en`, `ja`, `zh-hans`, `zh-hant`, `ru`, `bg`, `cs`, `pt-br`, `de`, `es`, `fr`, `te`, `hu`, `uk`, `it` or `ar`). 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-hans`, `zh-hant`, `ru`, `bg`, `cs`, `pt-br`, `de`, `es`, `fr`, `te`, `hu`, `uk`, `it`, `ar`, `tr`), in any case. `ui.state` reports `language` as written in the preferences (`auto`, `en`, `ja`, `zh-hans`, `zh-hant`, `ru`, `bg`, `cs`, `pt-br`, `de`, `es`, `fr`, `te`, `hu`, `uk`, `it`, `ar` or `tr`). 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, Traditional Chinese, Simplified Chinese, Russian, Bulgarian, German, Spanish, French, Telugu, Hungarian, Ukrainian, Italian, Brazilian Portuguese and Arabic translate them (about 2,000–2,140 entries each); Czech and Turkish 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. Per-language coverage, script support and what each language still needs are in [localization-parity.md](localization-parity.md).
 Dialogs, panels, menus, notices and history labels go through the catalog (`tl!`). Japanese, Traditional Chinese, Simplified Chinese, Russian, Bulgarian, German, Spanish, French, Telugu, Hungarian, Ukrainian, Italian, Brazilian Portuguese, Arabic and Slovenian translate them (about 2,000–2,190 entries each); Czech covers 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. Per-language coverage, script support and what each language still needs are in [localization-parity.md](localization-parity.md).
 
 Whole sentences that the layers below word — what the accessibility checker found, what the PDF/A verifier reports, what a signature's details say, what is wrong with the pages to print, what an edit is called in the history — are translated too, because those layers hand the sentence over apart from the document's own words. See [Sentences the engine words](#sentences-the-engine-words).
 
 The Ukrainian catalog has 2,047 entries, written from the meaning of the English labels using Ukrainian computing vocabulary. Commands use infinitives; fixed-count messages use count-neutral wording. Plural-aware messages use the three [CLDR Ukrainian integer forms](https://www.unicode.org/cldr/charts/48/supplemental/language_plural_rules.html#uk): `1 сторінка`, `2 сторінки`, `5 сторінок`; 11–14 take the third form, while 21 and 22 return to the first and second. Calendar dates use genitive month names (`9 жовтня 2026`), while headings use standalone names (`Жовтень 2026`). Home recommendation cards grow to fit translated text; the toolbar search hint truncates before the shortcut, with the full label available on hover.
 
+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. Chinese is drawn with the same craft-fonts CJK faces (in Simplified Chinese the `Hans` faces come first, so a line never mixes faces with different baselines), so a character none of them has shows a replacement box (and every Chinese character does in a build without craft-fonts). Russian, Bulgarian, Czech, Brazilian Portuguese, German, Spanish, French, Hungarian, Italian and Turkish need only the bundled Latin faces (tested in `tests/fonts.rs`). Hungarian uses the same one/other plural rule as English: 1 is singular, and every other count — including 0 — is the other form. After a numeral the noun stays singular (`1 oldal`, `2 oldal`). Telugu is drawn with a craft-fonts `Telu` face (Noto Sans Telugu, kept in the web build too), whose conjuncts egui shapes; a build without one shows Telugu labels as replacement boxes, and the release-pinned craft-fonts input has no Telugu face yet.
 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. Chinese is drawn with the same craft-fonts CJK faces (in Simplified Chinese the `Hans` faces come first, so a line never mixes faces with different baselines), so a character none of them has shows a replacement box (and every Chinese character does in a build without craft-fonts). Russian, Bulgarian, Czech, Brazilian Portuguese, German, Spanish, French, Hungarian, Italian and Slovenian need only the bundled Latin faces (tested in `tests/fonts.rs`). Slovenian has four plural forms: one (1, 101, 201…), two (2, 102…), few (3, 4, 103…) and other (everything else, including 0, 5–20 and 21+), so `@plural` entries list four forms (`1 stran`, `2 strani`, `3 strani`, `5 strani`). Hungarian uses the same one/other plural rule as English: 1 is singular, and every other count — including 0 — is the other form. After a numeral the noun stays singular (`1 oldal`, `2 oldal`). Telugu is drawn with a craft-fonts `Telu` face (Noto Sans Telugu, kept in the web build too), whose conjuncts egui shapes; a build without one shows Telugu labels as replacement boxes, and the release-pinned craft-fonts input has no Telugu face yet.
 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. Chinese is drawn with the same craft-fonts CJK faces (in Simplified Chinese the `Hans` faces come first, so a line never mixes faces with different baselines), so a character none of them has shows a replacement box (and every Chinese character does in a build without craft-fonts). Until craft-fonts has an allowed `Hans` face, the desktop app draws a Chinese interface with a Chinese face already installed on the machine (Microsoft YaHei or JhengHei on Windows, PingFang, Hiragino Sans GB or STHeiti on macOS, WenQuanYi or Droid Sans Fallback on Linux; never Noto CJK or Source Han), placed before the Japanese faces so a line keeps one face (#826). The web build has no installed fonts to fall back on. Russian, Bulgarian, Czech, Brazilian Portuguese, German, Spanish, French, Hungarian and Italian need only the bundled Latin faces (tested in `tests/fonts.rs`). Hungarian uses the same one/other plural rule as English: 1 is singular, and every other count — including 0 — is the other form. After a numeral the noun stays singular (`1 oldal`, `2 oldal`). Telugu is drawn with a craft-fonts `Telu` face (Noto Sans Telugu, kept in the web build too), whose conjuncts egui shapes; a build without one shows Telugu labels as replacement boxes, and the release-pinned craft-fonts input has no Telugu face yet.