feat: add runtime i18n API with manifest translations

test/runtime/events/runtime_event_dispatcher_test.dart

@@ -138,6 +138,7 @@ void main() {
       expect(script.events.map((event) => event.target), ['bad', 'good']);
     });
   });
+
 }
 
 RuntimeSession _activeSession() {
@@ -177,4 +178,10 @@ class _FakeScriptEngine implements ScriptEngine {
     }
     return GameDiff.empty;
   }
+
+  @override
+  void setTranslations({
+    required String locale,
+    required Map<String, Map<String, String>> translations,
+  }) {}
 }

test/runtime/game/flame_lua_game_test.dart

@@ -33,6 +33,7 @@ void main() {
       await expectLater(game.callLua('host.ready'), throwsA(isA<StateError>()));
     });
   });
+
 }
 
 class _FakeScriptEngine implements ScriptEngine {
@@ -66,6 +67,12 @@ class _FakeScriptEngine implements ScriptEngine {
   bool smokeTest(Map<String, Object?> context) {
     throw UnimplementedError();
   }
+
+  @override
+  void setTranslations({
+    required String locale,
+    required Map<String, Map<String, String>> translations,
+  }) {}
 }
 
 class _FakePackageRepository implements GamePackageRepository {

test/runtime/packages/game_package_activation_controller_test.dart

@@ -217,6 +217,7 @@ void main() {
       expect(store.markedPackages, [fallback.rootPath]);
     });
   });
+
 }
 
 Map<String, Object?> _context(GamePackage package) {
@@ -393,6 +394,12 @@ class _FakeScriptEngine implements ScriptEngine {
 
   @override
   GameDiff dispatchEvent(RuntimeEvent event) => GameDiff.empty;
+
+  @override
+  void setTranslations({
+    required String locale,
+    required Map<String, Map<String, String>> translations,
+  }) {}
 }
 
 const _validScript = '''