Merge PR #2102: Romanian (ro) interface language

Conflicts:
- crates/ui-egui/src/i18n.rs: language registration lines kept from both sides (Language::ALL has 18 entries).
- crates/ui-egui/tests/file_menu.rs: both language rows kept.
- docs/localization-parity.md: one Last updated line naming all changes; both revision rows kept, newest first.

crates/ui-egui/src/i18n.rs

@@ -20,6 +20,7 @@ mod ko;
 mod pl;
 mod nl;
 mod pt;
+mod ro;
 mod ru;
 mod sr;
 mod vi;
@@ -48,11 +49,12 @@ pub enum Language {
     Uk,
     Vi,
     Nl,
+    Ro,
 }
 
 impl Language {
-    pub const ALL: [Self; 17] = [
-        Self::En, Self::Es, Self::El, Self::Zh, Self::Ja, Self::Ko, Self::Ru, Self::PtBr, Self::De, Self::Cs, Self::Fr, Self::Sr, Self::Pl, Self::It, Self::Uk, Self::Vi, Self::Nl,
+    pub const ALL: [Self; 18] = [
+        Self::En, Self::Es, Self::El, Self::Zh, Self::Ja, Self::Ko, Self::Ru, Self::PtBr, Self::De, Self::Cs, Self::Fr, Self::Sr, Self::Pl, Self::It, Self::Uk, Self::Vi, Self::Nl, Self::Ro,
     ];
 
     /// The language's own name, shown in the switcher.
@@ -75,6 +77,7 @@ impl Language {
             Self::Uk => "Українська",
             Self::Vi => "Tiếng Việt",
             Self::Nl => "Nederlands",
+            Self::Ro => "Română",
         }
     }
 
@@ -98,6 +101,7 @@ impl Language {
             Self::Uk => "uk",
             Self::Vi => "vi",
             Self::Nl => "nl",
+            Self::Ro => "ro",
         }
     }
 
@@ -124,6 +128,7 @@ impl Language {
             "uk" => Some(Self::Uk),
             "vi" => Some(Self::Vi),
             "nl" => Some(Self::Nl),
+            "ro" => Some(Self::Ro),
             _ => None,
         }
     }
@@ -168,6 +173,7 @@ impl Language {
             Self::Uk => uk::translate(text),
             Self::Vi => vi::translate(text),
             Self::Nl => nl::translate(text),
+            Self::Ro => ro::translate(text),
         };
         translated.unwrap_or_else(|| text.rsplit_once('|').map_or(text, |(_, label)| label))
     }
@@ -239,6 +245,7 @@ mod tests {
             assert!(uk::translate(english).is_some_and(|text| !text.is_empty()), "missing Ukrainian: {english}");
             assert!(vi::translate(english).is_some_and(|text| !text.is_empty()), "missing Vietnamese: {english}");
             assert!(nl::translate(english).is_some_and(|text| !text.is_empty()), "missing Dutch: {english}");
+            assert!(ro::translate(english).is_some_and(|text| !text.is_empty()), "missing Romanian: {english}");
         }
         assert_eq!(Language::Ja.tr("Data"), "データ");
         assert_eq!(Language::Zh.tr("Data"), "数据");
@@ -294,6 +301,10 @@ mod tests {
         assert_eq!(Language::Nl.tr("Sheet1!A1"), "Sheet1!A1");
         assert_eq!(Language::Nl.tr("Page Layout|Orientation"), "Paginastand");
         assert_eq!(Language::Nl.tr("Orientation"), "Richting");
+        assert_eq!(Language::Ro.tr("Data"), "Date");
+        assert_eq!(Language::Ro.tr("Sheet1!A1"), "Sheet1!A1");
+        assert_eq!(Language::Ro.tr("Page Layout|Orientation"), "Orientare");
+        assert_eq!(Language::Ro.tr("Orientation"), "Orientare text");
         assert_eq!(Language::parse("xx"), None);
     }
 
@@ -383,6 +394,9 @@ mod tests {
         assert_eq!(Language::Nl.tr("Options|General"), "Algemeen");
         assert_eq!(Language::Nl.tr("Options|Save"), "Opslaan");
         assert_eq!(Language::Nl.tr("Sheet Options|View"), "Weergeven");
+        assert_eq!(Language::Ro.tr("Options|General"), "General");
+        assert_eq!(Language::Ro.tr("Options|Save"), "Salvare");
+        assert_eq!(Language::Ro.tr("Sheet Options|View"), "Vizualizare");
     }
 
     #[test]
@@ -439,6 +453,9 @@ mod tests {
         assert_eq!(Language::from_tag("nl-NL"), Some(Language::Nl));
         assert_eq!(Language::from_tag("nl_BE"), Some(Language::Nl));
         assert_eq!(Language::parse("nl"), Some(Language::Nl));
+        assert_eq!(Language::from_tag("ro-RO"), Some(Language::Ro));
+        assert_eq!(Language::from_tag("ro_MD.UTF-8"), Some(Language::Ro));
+        assert_eq!(Language::parse("ro"), Some(Language::Ro));
     }
 
     #[test]

crates/ui-egui/tests/file_menu.rs

@@ -138,6 +138,7 @@ fn translated_options_headings_show_no_context_prefix() {
         ("fr", ["Général", "Enregistrer"], ["Options|Général", "Options|Enregistrer"], ("Affichage", "Options de la feuille|Affichage")),
         ("sr", ["Opšte", "Sačuvaj"], ["Opcije|Opšte", "Opcije|Sačuvaj"], ("Prikaz", "Opcije lista|Prikaz")),
         ("nl", ["Algemeen", "Opslaan"], ["Opties|Algemeen", "Opties|Opslaan"], ("Weergeven", "Bladopties|Weergeven")),
+        ("ro", ["General", "Salvare"], ["Opțiuni|General", "Opțiuni|Salvare"], ("Vizualizare", "Opțiuni foaie|Vizualizare")),
     ] {
         let mut h = harness(Services::default());
         h.state_mut().run("app.language.set", serde_json::json!({"language": code})).unwrap();

docs/localization-parity.md

@@ -1,6 +1,6 @@
 # Localization parity
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-20 · **Change:** minor (the Japanese catalog covers the dialogs, messages and menus; Dutch interface language) · **Target:** Microsoft Excel (Microsoft 365), Excel for Mac 16.113.4
+> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-21 · **Change:** minor (the Japanese catalog covers the dialogs, messages and menus; Dutch interface language; Romanian interface catalog) · **Target:** Microsoft Excel (Microsoft 365), Excel for Mac 16.113.4
 
 Per-language status against Excel, which ships its UI in dozens of languages (Windows language
 packs cover 100+), with localized function names, argument separators, number and date formats,
@@ -85,6 +85,7 @@ language (none so far) and of localized function names.
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-10-21 | minor | Romanian interface (`ro`, Română): 970 labels covering every key of the other catalogs (`crates/ui-egui/src/i18n/ro.rs`), `ro-*` system locales, the View-tab switcher and `app.language.set`; context keys show no prefix (File › Options test). English formulas and formats; AI-assisted draft pending native-speaker review |
 | 2026-10-20 | minor | Japanese catalog (`i18n/ja.rs`) covers every key the Brazilian Portuguese catalog translates: the 398-label shared core moved verbatim plus 545 dialog, message, Backstage and menu strings — 943 keys, ~12% → ~43%. A test parses `pt.rs`'s source, so the two catalogs can't drift apart again. Portuguese re-measured at 943 (was 923) |
 | 2026-10-15 | minor | Italian catalog (`i18n/it.rs`, 971 entries, ~44%): every key the Brazilian Portuguese catalog translates plus the PivotTable Fields pane strings; `it` locale tags (it-IT, it-CH…) resolve to Italian. Labels follow Excel's Italian terminology; native-speaker review still pending |
 | 2026-10-20 | minor | Dutch (nl) interface catalog (`i18n/nl.rs`, 518 labels, ~24%): the shared key set every language must cover (ribbon, context menus, File view, dialog titles, Options page), matching the German, French and Czech catalogs; `nl-NL`, `nl-BE` locale tags resolve to Dutch |