Add complete Italian UI localization (#1941)

* Add complete Italian UI localization

Translate all 1509 English catalog entries originally, register Italiano, guard complete coverage and exercise Italian labels and UI rendering.

Co-authored-by: Copilot App <[email protected]>

* i18n: Italian is a partial catalog

it.json lacks 19 messages main has gained since this branch began, so as a
complete catalog it would fail every_complete_catalog_carries_every_english_message.
Like the other community languages, Italian is now partial: its gaps fall
back to English and new labels don't require an Italian string. The docs
line goes back to main's wording, with Italian among the partial catalogs.

Co-Authored-By: Claude Opus 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01LGeCa5jWWdroMWvXxN3LLM

---------

Co-authored-by: Copilot App <[email protected]>
Co-authored-by: Ben Herbruck <[email protected]>
Co-authored-by: bherbruck <[email protected]>
Co-authored-by: jyviko <[email protected]>
Co-authored-by: Claude Opus 5.5 <[email protected]>

ATTRIBUTION.md

@@ -93,6 +93,7 @@ Editable drawing code, native projects and shipped exports are collected under `
 | assets/locales/es.json | jawler | Spanish (Spain) translation of the English catalog, contributed upstream | MIT OR Apache-2.0 |
 | assets/locales/fr.json | rlartot | French translation of the English catalog, contributed upstream | MIT OR Apache-2.0 |
 | assets/locales/gl.json | Pablo López (pablopeza) | Galician translation of the English catalog, contributed upstream | MIT OR Apache-2.0 |
+| assets/locales/it.json | SolidCraft contributors | Original Italian translation of SolidCraft's English catalog; no commercial CAD text used | MIT OR Apache-2.0 |
 | assets/locales/ja.json | SolidCraft contributors | Original SolidCraft resource data or drawing code, collected without redesign | MIT OR Apache-2.0 |
 | assets/locales/ko.json | SolidCraft contributors | Original SolidCraft resource data or drawing code, collected without redesign | MIT OR Apache-2.0 |
 | assets/locales/ru.json | Alex Pro (del000) | Russian translation of the English catalog, contributed upstream | MIT OR Apache-2.0 |

crates/ui-egui/src/i18n.rs

@@ -37,6 +37,7 @@ static GERMAN: Catalog = Catalog::new("de", "Deutsch", include_str!(concat!(env!
 static SPANISH: Catalog = Catalog::new("es", "Español (España)", include_str!(concat!(env!("CARGO_MANIFEST_DIR"), "/../../assets/locales/es.json")));
 static FRENCH: Catalog = Catalog::new("fr", "Français", include_str!(concat!(env!("CARGO_MANIFEST_DIR"), "/../../assets/locales/fr.json")));
 static GALICIAN: Catalog = Catalog::new("gl", "Galego", include_str!(concat!(env!("CARGO_MANIFEST_DIR"), "/../../assets/locales/gl.json")));
+static ITALIAN: Catalog = Catalog::new("it", "Italiano", include_str!(concat!(env!("CARGO_MANIFEST_DIR"), "/../../assets/locales/it.json")));
 static JAPANESE: Catalog = Catalog::new("ja", "日本語", include_str!(concat!(env!("CARGO_MANIFEST_DIR"), "/../../assets/locales/ja.json")));
 static KOREAN: Catalog = Catalog::new("ko", "한국어", include_str!(concat!(env!("CARGO_MANIFEST_DIR"), "/../../assets/locales/ko.json")));
 static PORTUGUESE_BR: Catalog =
@@ -55,6 +56,7 @@ pub const LOCALES: &[&Catalog] = &[
     &SPANISH,
     &FRENCH,
     &GALICIAN,
+    &ITALIAN,
     &JAPANESE,
     &KOREAN,
     &PORTUGUESE_BR,
@@ -238,8 +240,8 @@ mod tests {
         ENGLISH.messages().values().map(String::as_str).collect()
     }
 
-    /// Catalogs delivered complete. English is the source catalog; Japanese was completed
+    /// Catalogs delivered complete. English is the source catalog; Czech, Italian, Japanese and Chinese
-    /// upstream, Chinese and Czech land complete here. German, Korean, Russian, French and Ukrainian
+    /// are complete. German, Korean, Russian, French and Ukrainian
     /// are partial (German and Korean predate the coverage guards; Russian, French and Ukrainian
     /// are kept partial so a new label doesn't need more translations), so their gaps fall back
     /// to English and are reported by `cargo xtask i18n` without failing the build, while
@@ -392,6 +394,39 @@ mod tests {
         assert_eq!(Locale(&PARTIAL).text("ui.extrude"), "Extrude");
     }
 
+    #[test]
+    fn italian_labels_templates_and_names_preserve_technical_values() {
+        assert!(is_supported("it"));
+        let it = Locale::for_language("it");
+        assert_eq!(it.name(), "Italiano");
+        for (source, expected) in [
+            ("Sketch", "Schizzo"),
+            ("Extrude", "Estrusione"),
+            ("Fillet", "Raccordo"),
+            ("Chamfer", "Smusso"),
+            ("Body", "Corpo"),
+            ("New Component", "Nuovo componente"),
+            ("CONSTRAINTS", "VINCOLI"),
+            ("Draft", "Sformo"),
+            ("Counterbore", "Lamatura"),
+            ("Countersink", "Svasatura"),
+        ] {
+            assert_eq!(it.label(source), expected, "{source}");
+        }
+        assert_eq!(it.dynamic("Sketch12"), "Schizzo12");
+        assert_eq!(it.dynamic("Body2"), "Corpo2");
+        assert_eq!(it.dynamic("Component3"), "Componente3");
+        assert_eq!(it.dynamic("Units: mm"), "Unità: mm");
+        assert_eq!(it.dynamic("4 degrees of freedom"), "4 gradi di libertà");
+        assert_eq!(it.given_name("Fillet"), "Fillet");
+        assert_eq!(it.label("solid.extrude"), "solid.extrude");
+        assert_eq!(it.format("document.save_changes", &[("name", "Staffa {v2}")]), "Salvare le modifiche a Staffa {v2}?");
+        assert_eq!(
+            it.format("ui.command_palette_hint", &[("example", "solid.extrude {\"distance\": 20}")]),
+            "Digita un comando, ad es. solid.extrude {\"distance\": 20}  — oppure premi S per cercare"
+        );
+    }
+
     /// `label()`'s id fallback (an argument that matches no other entry's English text is
     /// looked up as an id directly) is how the Sketch Palette reaches `ui.palette_profile` and
     /// `ui.palette_points` without colliding with "Profile" / "Points" elsewhere (see the

crates/ui-egui/src/i18n_ui_tests.rs

@@ -21,6 +21,24 @@ fn japanese_dialog_keeps_english_scenario_handles() {
     assert!(h.widget("Cancel").is_some());
 }
 
+#[test]
+fn italian_dialog_keeps_english_scenario_handles() {
+    let mut h = Harness::new();
+    h.app.preferences.language = "it".into();
+    h.app.home.open = false;
+    h.call("ui.start", json!({"command":"sketch.create"}));
+    h.frames(3);
+    assert!(h.widget("Piano").is_some());
+    assert!(h.widget("Annulla").is_some());
+    assert!(!scenario::handles("dialog:Plane").is_empty());
+    assert_eq!(crate::i18n::tr("ui.preferences"), "Preferences");
+
+    h.app.preferences.language = "en".into();
+    h.frames(3);
+    assert!(h.widget("Plane").is_some());
+    assert!(h.widget("Cancel").is_some());
+}
+
 #[test]
 fn sketch_palette_profile_and_points_rows_show_their_own_translation() {
     // ui.palette_profile / ui.palette_points are reached by id, not by the usual English-text
@@ -67,6 +85,7 @@ fn window_chrome_renders_in_the_active_language() {
         ("ko", "브라우저", "선택 필터", "면"),
         ("ru", "БРАУЗЕР", "Фильтр выделения", "Грани"),
         ("fr", "NAVIGATEUR", "Filtre de sélection", "Faces"),
+        ("it", "STRUTTURA", "Filtro di selezione", "Facce"),
         ("uk", "БРАУЗЕР", "Фільтр виділення", "Грані"),
     ] {
         let mut h = Harness::new();
@@ -135,6 +154,22 @@ fn home_page_renders_in_the_active_language() {
         }
     }
     let cases = [
+        (
+            "it",
+            [
+                "Nuovo progetto",
+                "Apri…",
+                "Documentazione",
+                "Segnala un problema",
+                "Novità",
+                "Scorciatoie da tastiera",
+                "Preferenze",
+                "Recenti",
+                "Esempi",
+                "Piastra di esempio",
+            ],
+            "non presente\nAperto 2 h fa",
+        ),
         (
             "ja",
             [

docs/localization.md

@@ -1,7 +1,7 @@
 # UI localization
 
-SolidCraft embeds its translations and works offline. English, Japanese, German, French, Galician, Korean,
+SolidCraft embeds its translations and works offline. English, Czech, German, Spanish, French, Galician, Italian,
-Brazilian Portuguese, Russian, Ukrainian, Turkish and Chinese are currently registered in `crates/ui-egui/src/i18n.rs`. Adding a language requires an
+Japanese, Korean, Brazilian Portuguese, Russian, Turkish, Ukrainian and Chinese are currently registered in `crates/ui-egui/src/i18n.rs`. Adding a language requires an
 embedded catalog and one registration there; the preferences selector and validation use the same
 registry.
 
@@ -31,7 +31,7 @@ that looks untranslated. Two guards catch that in the build:
 
 - `every_complete_catalog_carries_every_english_message` — adding a key to `en.json`
   without giving it to a complete catalog fails the tests. English is the source catalog,
-  Japanese and Chinese are delivered complete; German, Galician, Korean, Brazilian Portuguese, Russian, French, Ukrainian and
+  Japanese and Chinese are delivered complete; German, Spanish, Galician, Italian, Korean, Brazilian Portuguese, Russian, French, Ukrainian and
   Turkish are partial — their gaps fall back to English and are reported by `cargo xtask i18n` without
   failing the build. A new label needs en, ja, zh, de and ko; Russian, French and Ukrainian may
   follow later.
@@ -59,6 +59,14 @@ claim it, or the English-text lookup would silently pick one.
 
 ## Rendering and coverage
 
+The Italian catalog uses original translations of SolidCraft's English messages, not text
+extracted from commercial CAD software. Its core terminology is Schizzo (Sketch),
+Estrusione (Extrude), Raccordo (Fillet), Smusso (Chamfer), Corpo (Body), Componente
+(Component) and Vincolo (Constraint). Draft geometry is Sformo, while a report draft
+is Bozza; Counterbore is Lamatura and Countersink is Svasatura. Established technical
+terms such as Loft, Sweep, Spline and Offset remain unchanged. Command IDs, shortcuts,
+file formats, units and user-provided names are not translated.
+
 One immutable `Locale` type handles all translations. Table widgets without an app reference
 use a render scope that restores the previous locale when it exits, including nested renders.
 Standalone translated panels enter the same scope. Measure rendered text to size custom