i18n: Turkish (tr) interface translation and language support

Add crates/ui-egui/src/i18n/tr.tsv, clean-room Turkish translations matching every entry in the Spanish catalog plus the native macOS Settings menu (3,590 entries).

Language::Tr ("Türkçe") is persisted as `tr` in `general.interfaceLanguage`; it appears in Edit > Language (and native macOS menu), Settings > General, and System Language picks it for `tr-*` locales.

Tests cover the core menus, reject dead entries, verify bundled font rendering for Turkish characters (Ç, Ğ, İ, Ö, Ş, Ü, ç, ğ, ı, ö, ş, ü), switching/persistence across restarts, and locale matching. Attribution sidecar, ATTRIBUTION.md, ui-egui README, gaps.md, and localization-parity.md updated.

ATTRIBUTION.md

@@ -10,6 +10,7 @@ iconography, images or other Adobe assets; open licences only; every asset attri
 | Asset | Author | Source | Licence |
 |---|---|---|---|
 | `crates/ui-egui/src/i18n/it.tsv` | FilmCraft contributors | Original work: clean-room Italian interface translations | MIT OR Apache-2.0 |
+| `crates/ui-egui/src/i18n/tr.tsv` | FilmCraft contributors | Original work: clean-room Turkish interface translations | MIT OR Apache-2.0 |
 | `crates/ui-egui/src/i18n/id.tsv` | FilmCraft contributors | Original work: clean-room Indonesian interface translations | MIT OR Apache-2.0 |
 | `crates/ui-egui/src/i18n/ko.tsv` | FilmCraft contributors | Original work: clean-room Korean interface translations | MIT OR Apache-2.0 |
 | `crates/ui-egui/src/i18n/fr.tsv` | FilmCraft contributors | Original work: clean-room French interface translations | MIT OR Apache-2.0 |

apps/filmcraft/src/native_menu.rs

@@ -135,6 +135,8 @@ pub fn install(app: &FilmcraftApp, ctx: egui::Context) -> (Receiver<String>, Men
             filmcraft_ui_egui::i18n::Language::It
         } else if checked("app.language.korean") {
             filmcraft_ui_egui::i18n::Language::Ko
+        } else if checked("app.language.turkish") {
+            filmcraft_ui_egui::i18n::Language::Tr
         } else {
             filmcraft_ui_egui::i18n::Language::En
         };

crates/engine/src/settings.rs

@@ -34,7 +34,7 @@ pub const PREFS_VERSION: u32 = 2;
 #[serde(rename_all = "camelCase", default)]
 pub struct GeneralPrefs {
     /// Interface language (persisted independently of projects): `en`, `ja`, `es`, `pt-br`, `uk`,
-    /// `zh-cn`, `de`, `ru`, `fr`, `id`, `it`, or `system` (the default: the operating system's preferred language when the
+    /// `zh-cn`, `de`, `ru`, `fr`, `id`, `it`, `ko`, `tr`, or `system` (the default: the operating system's preferred language when the
     /// interface has it, otherwise English).
     pub interface_language: String,
     /// "At Startup": `showHome` (FilmCraft: the demo project), `openMostRecent`, `emptyProject`.
@@ -1009,6 +1009,7 @@ static CATEGORIES: &[Category] = &[
                     ("id", "Bahasa Indonesia"),
                     ("it", "Italiano"),
                     ("ko", "한국어"),
+                    ("tr", "Türkçe"),
                 ]),
                 true,
             ),

crates/engine/src/settings_tests.rs

@@ -50,6 +50,12 @@ fn interface_language_persists_and_rejects_hostile_values() {
     }
     set(&mut s, "general.interfaceLanguage", json!("it"));
     assert_eq!(Preferences::load(&path).general.interface_language, "it");
+    // Turkish is stored as `tr`, not a locale tag
+    for value in [json!("tr-TR"), json!("TR")] {
+        assert!(s.execute("prefs.set", json!({"key": "general.interfaceLanguage", "value": value})).is_err());
+    }
+    set(&mut s, "general.interfaceLanguage", json!("tr"));
+    assert_eq!(Preferences::load(&path).general.interface_language, "tr");
     // back to following the operating system (#218)
     set(&mut s, "general.interfaceLanguage", json!("system"));
     assert_eq!(Preferences::load(&path).general.interface_language, "system");

crates/ui-egui/README.md

@@ -18,7 +18,7 @@ the committed span and undo. Set `FILMCRAFT_UI_SNAPSHOT_DIR` to render screensho
 ## Localisation
 
 Edit > Language offers English, Japanese, Spanish, Brazilian Portuguese, Ukrainian, Simplified
-Chinese, German, Russian, French, Indonesian, Korean and Italian (which cover the whole interface). The language is stored in the engine's `general.interfaceLanguage` preference,
+Chinese, German, Russian, French, Indonesian, Korean, Italian and Turkish (which cover the whole interface). The language is stored in the engine's `general.interfaceLanguage` preference,
 restored on startup, and also available in Settings > General.
 Its default, System Language (`system`), follows the operating system: the first of the user's
 preferred languages that the interface has (the host supplies them through

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

@@ -49,6 +49,7 @@ pub enum Language {
     It,
     /// Korean; Hangul needs an installed system font ([`korean_font_available`]).
     Ko,
+    Tr,
 }
 
 static JAPANESE: OnceLock<Catalog> = OnceLock::new();
@@ -62,9 +63,11 @@ static FRENCH: OnceLock<Catalog> = OnceLock::new();
 static KOREAN: OnceLock<Catalog> = OnceLock::new();
 static INDONESIAN: OnceLock<Catalog> = OnceLock::new();
 static ITALIAN: OnceLock<Catalog> = OnceLock::new();
+static TURKISH: OnceLock<Catalog> = OnceLock::new();
 
 impl Language {
-    pub const ALL: [Self; 12] = [Self::En, Self::Ja, Self::Es, Self::PtBr, Self::Uk, Self::ZhCn, Self::De, Self::Ru, Self::Fr, Self::Id, Self::Ko, Self::It];
+    pub const ALL: [Self; 13] =
+        [Self::En, Self::Ja, Self::Es, Self::PtBr, Self::Uk, Self::ZhCn, Self::De, Self::Ru, Self::Fr, Self::Id, Self::Ko, Self::It, Self::Tr];
 
     pub fn name(self) -> &'static str {
         match self {
@@ -80,6 +83,7 @@ impl Language {
             Self::Id => "Bahasa Indonesia",
             Self::It => "Italiano",
             Self::Ko => "한국어",
+            Self::Tr => "Türkçe",
         }
     }
 
@@ -97,6 +101,7 @@ impl Language {
             "id" => Some(Self::Id),
             "it" => Some(Self::It),
             "ko" => Some(Self::Ko),
+            "tr" => Some(Self::Tr),
             _ => None,
         }
     }
@@ -107,11 +112,11 @@ impl Language {
     /// any German (`de-AT`, `de_CH.UTF-8`…) gets the German one and any French (`fr-CA`, `fr_BE.UTF-8`…)
     /// the French one; any Indonesian (`id-ID`, `id_ID.UTF-8`, and the legacy `in-ID` that older Java
     /// and Android runtimes report) the Indonesian one; any Italian (`it-IT`, `it-CH`, `it_IT.UTF-8`…)
-    /// the Italian one. Chinese gets the Simplified catalog
+    /// the Italian one; any Turkish (`tr`, `tr-TR`, `tr_TR.UTF-8`…) the Turkish one. Chinese gets the Simplified catalog
     /// only for Simplified locales (`zh`, `zh-CN`, `zh-SG`, `zh-Hans…`); Traditional ones (`zh-TW`,
     /// `zh-HK`, `zh-MO`, `zh-Hant…`) are skipped.
     pub fn from_locales(tags: &[String]) -> Self {
-        const PRIMARY: [(&str, Language); 12] = [
+        const PRIMARY: [(&str, Language); 13] = [
             ("en", Language::En),
             ("ja", Language::Ja),
             ("es", Language::Es),
@@ -124,6 +129,7 @@ impl Language {
             ("in", Language::Id),
             ("it", Language::It),
             ("ko", Language::Ko),
+            ("tr", Language::Tr),
         ];
         tags.iter()
             .find_map(|tag| {
@@ -156,6 +162,7 @@ impl Language {
             Self::Id => "id",
             Self::It => "it",
             Self::Ko => "ko",
+            Self::Tr => "tr",
         }
     }
 
@@ -174,6 +181,7 @@ impl Language {
             Self::Id => Some(INDONESIAN.get_or_init(|| Catalog::parse(include_str!("id.tsv")))),
             Self::It => Some(ITALIAN.get_or_init(|| Catalog::parse(include_str!("it.tsv")))),
             Self::Ko => Some(KOREAN.get_or_init(|| Catalog::parse(include_str!("ko.tsv")))),
+            Self::Tr => Some(TURKISH.get_or_init(|| Catalog::parse(include_str!("tr.tsv")))),
         }
     }
 
@@ -354,6 +362,7 @@ mod tests {
             ("id", include_str!("id.tsv")),
             ("it", include_str!("it.tsv")),
             ("ko", include_str!("ko.tsv")),
+            ("tr", include_str!("tr.tsv")),
         ] {
             let (entries, errors) = catalog::parse_entries(text);
             assert!(errors.is_empty(), "{code}: {errors:?}");
@@ -415,6 +424,13 @@ mod tests {
         assert_eq!(Language::It.tr("An untranslated label"), "An untranslated label");
         assert_eq!(Language::parse("it"), Some(Language::It));
         assert_eq!(Language::parse("it-IT"), None, "the preference stores the bare code");
+        assert_eq!(Language::Tr.name(), "Türkçe");
+        assert_eq!(Language::Tr.tr("File"), "Dosya");
+        assert_eq!(Language::Tr.tr("Save As…"), "Farklı Kaydet…");
+        assert_eq!(Language::Tr.tr("Tatil videosu.mp4"), "Tatil videosu.mp4");
+        assert_eq!(Language::Tr.tr("An untranslated label"), "An untranslated label");
+        assert_eq!(Language::parse("tr"), Some(Language::Tr));
+        assert_eq!(Language::parse("tr-TR"), None, "the preference stores the bare code");
         for l in Language::ALL {
             assert_eq!(Language::parse(l.code()), Some(l));
             let json = serde_json::to_string(&l).unwrap();
@@ -997,6 +1013,24 @@ mod tests {
         let mut restarted = filmcraft_engine::Session::default();
         restarted.prefs = serde_json::from_str(&prefs).unwrap();
         assert_eq!(crate::FilmcraftApp::new(restarted).ui.language, Language::It);
+        let result = crate::menus::invoke(&mut app, &ctx, "app.language.turkish", serde_json::json!({})).unwrap();
+        assert_eq!(result, serde_json::json!("tr"));
+        assert_eq!((app.ui.language, current()), (Language::Tr, Language::Tr));
+        assert_eq!(app.session.prefs.general.interface_language, "tr");
+        for it in crate::menus::menu_items(&app).iter().filter(|it| it.id.starts_with("app.language.")) {
+            assert_eq!(it.checked, Some(it.id == "app.language.turkish"), "{}", it.id);
+        }
+        let items = crate::menus::menu_items(&app);
+        let label = |id: &str| items.iter().find(|it| it.id == id).map(|it| it.label.as_str());
+        assert_eq!(label("file.saveAs"), Some("Farklı Kaydet…"));
+        assert_eq!(label("app.language.italian"), Some("Italiano"));
+        assert_eq!(label("app.language.turkish"), Some("Türkçe"));
+        let saved = serde_json::to_string(&app.ui).unwrap();
+        assert!(saved.contains("\"language\":\"tr\""), "{saved}");
+        let prefs = serde_json::to_string(&app.session.prefs).unwrap();
+        let mut restarted = filmcraft_engine::Session::default();
+        restarted.prefs = serde_json::from_str(&prefs).unwrap();
+        assert_eq!(crate::FilmcraftApp::new(restarted).ui.language, Language::Tr);
         crate::menus::invoke(&mut app, &ctx, "app.language.english", serde_json::json!({})).unwrap();
         assert_eq!(app.ui.language, Language::En);
         set_current(Language::En);
@@ -1042,6 +1076,13 @@ mod tests {
         for none in [&["ita"][..], &["i"], &["-it"]] {
             assert_eq!(l(none), Language::En, "{none:?}");
         }
+        for tag in ["tr", "TR", "tr-TR", "tr_TR.UTF-8", "tr_TR.UTF-8@euro", "tr_TR"] {
+            assert_eq!(l(&[tag]), Language::Tr, "{tag}");
+        }
+        assert_eq!(l(&["tr-TR", "de-CH", "fr-CH", "en"]), Language::Tr);
+        for none in [&["tur"][..], &["t"], &["-tr"]] {
+            assert_eq!(l(none), Language::En, "{none:?}");
+        }
         assert_eq!(l(&["sv-SE", "nl", "es-MX", "ja"]), Language::Es, "the first one the interface has");
         assert_eq!(l(&["rm-CH", "de-CH", "fr-CH", "en"]), Language::De);
         assert_eq!(l(&["rm-CH", "fr-CH", "de-CH", "en"]), Language::Fr);
@@ -1266,6 +1307,40 @@ mod tests {
         set_current(Language::En);
     }
 
+    /// Turkish covers the whole interface (the Spanish catalog's entries and the native macOS
+    /// Settings menu); like Italian, the tests require only the core menus, so strings added
+    /// later show in English until they are translated, and every entry must have a Spanish
+    /// counterpart.
+    #[test]
+    fn turkish_covers_the_menus_and_has_no_dead_entries() {
+        let (entries, errors) = catalog::parse_entries(include_str!("tr.tsv"));
+        assert!(errors.is_empty(), "{errors:?}");
+        for (ctx, en, _) in &entries {
+            assert!(ctx.is_empty() && (Language::Es.has(en) || en == "Settings"), "Turkish entry without a Spanish one: {ctx:?} {en:?}");
+        }
+        let (core, _) = catalog::parse_entries(include_str!("uk.tsv"));
+        for (_, en, _) in core {
+            assert!(Language::Tr.has(&en), "missing Turkish menu label: {en}");
+        }
+        for en in crate::menus::MENUS.into_iter().chain(["Audio", "Settings"]) {
+            assert!(Language::Tr.has(en), "untranslated Turkish menu: {en}");
+        }
+        // beyond the menus: panels, effects and their parameters, settings, status messages
+        for (en, tr) in [
+            ("Settings", "Ayarlar"),
+            ("Gaussian Blur", "Gauss Bulanıklığı"),
+            ("Audio Track Mixer", "Ses İzi Karıştırıcısı"),
+            ("Sequence", "Sekans"),
+            ("Playhead", "Oynatma Kafası"),
+        ] {
+            assert_eq!(Language::Tr.tr(en), tr);
+        }
+        set_current(Language::Tr);
+        assert!(matches_query("Gaussian Blur", "bulanıklığı"));
+        assert!(matches_query("Gaussian Blur", "gaussian"));
+        set_current(Language::En);
+    }
+
     /// Every non-ASCII character of `text` renders with the bundled interface fonts, in every family.
     fn assert_bundled_fonts_cover(text: impl Iterator<Item = char>) {
         let ctx = egui::Context::default();
@@ -1338,6 +1413,16 @@ mod tests {
         assert_bundled_fonts_cover(alphabet.chars().chain(Language::It.name().chars()).chain(letters));
     }
 
+    #[test]
+    fn turkish_renders_with_bundled_fonts() {
+        let (entries, _) = catalog::parse_entries(include_str!("tr.tsv"));
+        // every Turkish letter (ç, ğ, ı, ö, ş, ü, Ç, Ğ, İ, Ö, Ş, Ü), even ones no entry uses yet,
+        // and every letter, curly quote, dash and ellipsis the entries use (symbols such as ✔ come from the English sources)
+        let alphabet = "ÇĞİÖŞÜçğıöşü";
+        let letters = entries.iter().flat_map(|(_, _, tr)| tr.chars()).filter(|ch| ch.is_alphabetic() || "“”‘’–—…".contains(*ch));
+        assert_bundled_fonts_cover(alphabet.chars().chain(Language::Tr.name().chars()).chain(letters));
+    }
+
     #[test]
     fn japanese_needs_an_installed_font() {
         let mut app = crate::FilmcraftApp::new(filmcraft_engine::Session::default());

crates/ui-egui/src/i18n/tr.tsv.attribution

@@ -0,0 +1,8 @@
+asset:        tr.tsv
+title:        Turkish interface translation catalog
+author:       FilmCraft contributors
+source:       original work
+license:      MIT OR Apache-2.0
+license-file: LICENSE-MIT and LICENSE-APACHE
+added:        2026-10-18 by MOzcelik14
+notes:        Original English-to-Turkish interface translations using clean-room NLE vocabulary.

crates/ui-egui/src/menus.rs

@@ -38,6 +38,7 @@ pub const UI_COMMANDS: &[UiCommand] = &[
     uic!("app.language.indonesian", "Bahasa Indonesia", ["Edit", "Language"], None),
     uic!("app.language.italian", "Italiano", ["Edit", "Language"], None),
     uic!("app.language.korean", "한국어", ["Edit", "Language"], None),
+    uic!("app.language.turkish", "Türkçe", ["Edit", "Language"], None),
     uic!("source.playback.toggle", "Source Play/Stop", [], None),
     uic!("source.playback.play", "Play Source", [], None),
     uic!("source.playback.stop", "Stop Source", [], None),
@@ -199,6 +200,7 @@ pub fn invoke(app: &mut FilmcraftApp, ctx: &egui::Context, id: &str, mut params:
             | "app.language.indonesian"
             | "app.language.italian"
             | "app.language.korean"
+            | "app.language.turkish"
     ) {
         // Japanese needs the craft-fonts (built with CRAFT_FONTS_DIR) or a font installed on the system
         if id == "app.language.japanese" && !crate::i18n::install_japanese_font(ctx) {
@@ -224,6 +226,7 @@ pub fn invoke(app: &mut FilmcraftApp, ctx: &egui::Context, id: &str, mut params:
             "app.language.indonesian" => crate::i18n::Language::Id,
             "app.language.italian" => crate::i18n::Language::It,
             "app.language.korean" => crate::i18n::Language::Ko,
+            "app.language.turkish" => crate::i18n::Language::Tr,
             _ => crate::i18n::Language::En,
         };
         // The preference is updated in memory before it is written, so a failed write (read-only
@@ -697,6 +700,7 @@ pub fn menu_items(app: &FilmcraftApp) -> Vec<MenuItem> {
             "app.language.indonesian" => it.checked = Some(app.ui.language == crate::i18n::Language::Id),
             "app.language.italian" => it.checked = Some(app.ui.language == crate::i18n::Language::It),
             "app.language.korean" => it.checked = Some(app.ui.language == crate::i18n::Language::Ko),
+            "app.language.turkish" => it.checked = Some(app.ui.language == crate::i18n::Language::Tr),
             _ => {}
         }
         if it.id.starts_with("view.") {

docs/gaps.md

@@ -247,6 +247,9 @@ platforms** G4, G9, G17; **performance** G16; **ecosystem** G11; **measurement**
 - **Done:** Italian: `it.tsv` has every entry of the Spanish catalog (~100%), in Edit ▸ Language,
   Settings ▸ General and the native macOS menu; System Language picks it for `it-*` locales.
   Native-speaker review welcome.
+- **Done:** Turkish: `tr.tsv` has every entry of the Spanish catalog (~100%), in Edit ▸ Language,
+  Settings ▸ General and the native macOS menu; System Language picks it for `tr-*` locales.
+  Native-speaker review welcome.
 - **Estimate:** 150–230 h. Doc: [localization-parity.md](localization-parity.md).
 
 ## G15. Interchange never validated in Avid / Pro Tools; slow XML import

docs/localization-parity.md

@@ -10,7 +10,7 @@ Portuguese (Brazil), Russian, Simplified Chinese.
 
 Edit ▸ Language (also Settings ▸ General, `general.interfaceLanguage`) switches the interface and
 persists across restarts; System Language (the default) follows the OS's or browser's preferred
-languages and falls back to English. Commands `app.language.<english|japanese|spanish|portuguese|ukrainian|chinese|german|russian|french|indonesian|italian>`
+languages and falls back to English. Commands `app.language.<english|japanese|spanish|portuguese|ukrainian|chinese|german|russian|french|indonesian|italian|korean|turkish>`
 are reachable over the control channel. One catalog per language,
 `crates/ui-egui/src/i18n/<code>.tsv` (format in the header of `es.tsv`); UI code wraps strings in
 `tl!("…")` / `tlf!("…{name}", name)`, and registry names (effects and their parameters, settings,
@@ -54,6 +54,7 @@ whole interface, one PR) at ~4–8 h per language for the catalog plus tests.
 | Korean | ko | 3,573 (same entries as Spanish, plus the macOS Settings item) | as Spanish | installed system Hangul font (Malgun Gothic, Apple SD Gothic Neo, Noto Sans CJK KR…); refused without one | not recorded; welcome | partial (#508) | review; Hangul in craft-fonts for the web |
 | Vietnamese | vi | 0 (0%) | — | Latin with stacked diacritics (font coverage to check) | — | none | 6–12 h + review |
 | *Other shipped:* Italian | it | 3,573 (same entries as Spanish, plus the macOS Settings item); must cover the core menus, no entry without a Spanish one | as Spanish | Latin (bundled fonts) | not recorded; welcome | partial | review |
+| *Other shipped:* Turkish | tr | 3,590 (same entries as Spanish, plus the macOS Settings item); must cover the core menus, no entry without a Spanish one | as Spanish | Latin (bundled fonts) | not recorded; welcome | partial | review |
 | *Other shipped:* Ukrainian | uk | 351 (10.0%) | menus only | Cyrillic (bundled) | not recorded | menus only | 5–9 h |
 
 Premiere also ships Italian, which we now cover like Spanish, and Russian (6–10 h).