Merge pull request #309 from FeiLiuEM/i18n/zh-hans

i18n: add Simplified and Traditional Chinese (zh-hans, zh-hant) UI translation

crates/engine/src/prefs.rs

@@ -23,7 +23,13 @@ pub const PREFS_VERSION: u32 = 2;
 pub const PREFS_FILE: &str = "prefs.json";
 
 /// Settings ▸ General ▸ Language: (label, `general.language` value).
-pub const LANGUAGES: &[(&str, &str)] = &[("Match System", "system"), ("English", "en"), ("日本語", "ja")];
+pub const LANGUAGES: &[(&str, &str)] = &[
+    ("Match System", "system"),
+    ("English", "en"),
+    ("日本語", "ja"),
+    ("简体中文", "zh-hans"),
+    ("繁體中文", "zh-hant"),
+];
 
 /// Settings ▸ Startup & Repair ▸ Window Graphics: (label, `startup.windowGraphics` value).
 pub const WINDOW_GRAPHICS: &[(&str, &str)] = &[("Automatic", "auto"), ("OpenGL (compatibility)", "gl")];

crates/engine/src/tests_settings.rs

@@ -514,6 +514,17 @@ fn interface_language_is_validated_persisted_and_backward_compatible() {
         assert_eq!(s.prefs.general.language, "ja");
         assert_eq!(store.read(PREFS_FILE).unwrap(), saved);
     }
+    // zh-hans is registered alongside en and ja: it is accepted, persisted and read back.
+    s.execute("prefs.set", json!({"key": "general.language", "value": "zh-hans"})).unwrap();
+    let mut zh = Session { config: Some(store.clone()), ..Default::default() };
+    zh.load_settings();
+    assert_eq!(zh.prefs.general.language, "zh-hans");
+    // zh-hant is the same: another language of the registered set, not an error.
+    s.execute("prefs.set", json!({"key": "general.language", "value": "zh-hant"})).unwrap();
+    let mut zh_hant = Session { config: Some(store.clone()), ..Default::default() };
+    zh_hant.load_settings();
+    assert_eq!(zh_hant.prefs.general.language, "zh-hant");
+    s.execute("prefs.set", json!({"key": "general.language", "value": "ja"})).unwrap();
     let mut reloaded = Session { config: Some(store), ..Default::default() };
     reloaded.load_settings();
     assert_eq!(reloaded.prefs.general.language, "ja");

crates/ui-egui/src/native_menu.rs

@@ -184,7 +184,16 @@ pub fn build(app: &EffectcraftApp) -> NativeMenu {
                         if role == Role::Hide && !services_added {
                             out.push(NativeNode::Predefined {
                                 role: Role::Services,
-                                label: if crate::i18n::japanese(app) { "サービス" } else { "Services" }.into(),
+                                label: if crate::i18n::japanese(app) {
+                                    "サービス"
+                                } else if crate::i18n::simplified(app) {
+                                    "服务"
+                                } else if crate::i18n::traditional(app) {
+                                    "服務"
+                                } else {
+                                    "Services"
+                                }
+                                .into(),
                                 command: String::new(),
                             });
                             out.push(NativeNode::Separator);

docs/preferences.md

@@ -29,7 +29,7 @@ Commands (CLI, MCP, control channel):
 
 ### Settings that change behaviour
 
-- `general.language`: interface language (`system` / `en` / `ja`), Settings ▸ General ▸ Language; menu labels change immediately. `system` (Match System, the default) follows the operating system's interface language where EffectCraft has a translation and is English otherwise; the browser build stays in English with it. Native Japanese UI uses installed system fonts; the web host must supply a Japanese font.
+- `general.language`: interface language (`system` / `en` / `ja` / `zh-hans` / `zh-hant`), Settings ▸ General ▸ Language; menu labels change immediately. `system` (Match System, the default) follows the operating system's interface language where EffectCraft has a translation and is English otherwise: a Simplified Chinese locale (`zh`, `zh-CN`, `zh_CN.UTF-8`, `zh-Hans-CN`, `zh-SG`) selects `zh-hans`, a Traditional one (`zh-TW`, `zh-HK`, `zh-Hant`, `zh_MO`) selects `zh-hant`; the browser build stays in English with it. Native Japanese, Simplified and Traditional Chinese UI uses installed system fonts; the web host must supply a Japanese font.
 - `general.undoLevels`: Levels of Undo
 - `general.pathPointSize`: Path Point and Handle Size
 - `general.recentItems`: Recent Projects Shown