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 <echelon@gmail.com>

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");