fix: make Ukrainian the built-in translation language

Sources/VoidBar/Services/Translator.swift

@@ -8,7 +8,7 @@ import Translation
 /// holding the result. `TranslatePane` supplies the session.
 @MainActor
 final class Translator: ObservableObject {
-    static let russian = Locale.Language(identifier: "ru")
+    static let ukrainian = Locale.Language(identifier: "uk")
     static let english = Locale.Language(identifier: "en")
 
     /// Both ends are always named. Leaving the source to the framework looks
@@ -40,16 +40,16 @@ final class Translator: ObservableObject {
     var trimmed: String { input.trimmingCharacters(in: .whitespacesAndNewlines) }
     var route: Route { Self.route(for: trimmed) }
 
-    /// Russian goes out to English, everything else comes in to Russian.
+    /// Ukrainian goes out to English, everything else comes in to Ukrainian.
     ///
     /// Decided by script rather than by language detection: a single word is
     /// far too short to identify reliably, and "привет" comes back as Bulgarian
     /// often enough to matter.
     static func route(for text: String) -> Route {
         let cyrillic = text.unicodeScalars.contains { (0x0400...0x04FF).contains($0.value) }
         return cyrillic
-            ? Route(source: russian, target: english)
-            : Route(source: english, target: russian)
+            ? Route(source: ukrainian, target: english)
+            : Route(source: english, target: ukrainian)
     }
 
     func retry() {
@@ -108,7 +108,7 @@ final class Translator: ObservableObject {
         pasteboard.setString(output, forType: .string)
     }
 
-    /// "Русский", "English" — for the column headers. Named in the language the
+    /// "Українська", "English" — for the column headers. Named in the language the
     /// panel itself is in, not in the system's: those two can differ, and a
     /// column headed in one language above a button worded in another reads as
     /// a mistake.
@@ -120,7 +120,7 @@ final class Translator: ObservableObject {
         return name.prefix(1).uppercased() + name.dropFirst()
     }
 
-    /// Short code for the header badge — "EN → RU" reads at a glance where a
+    /// Short code for the header badge — "EN → UK" reads at a glance where a
     /// spelled-out name would not fit in the strip.
     static func code(_ language: Locale.Language) -> String {
         language.languageCode?.identifier.uppercased() ?? "?"

Tests/VoidBarTests/TranslatorTests.swift

@@ -0,0 +1,19 @@
+import XCTest
+@testable import VoidBar
+
+@MainActor
+final class TranslatorTests: XCTestCase {
+    func testEnglishRoutesToUkrainian() {
+        let route = Translator.route(for: "Hello, world")
+
+        XCTAssertEqual(route.source.languageCode?.identifier, "en")
+        XCTAssertEqual(route.target.languageCode?.identifier, "uk")
+    }
+
+    func testUkrainianRoutesToEnglish() {
+        let route = Translator.route(for: "Привіт, світе")
+
+        XCTAssertEqual(route.source.languageCode?.identifier, "uk")
+        XCTAssertEqual(route.target.languageCode?.identifier, "en")
+    }
+}