fix: localize batched app update notifications

AppImage/scripts/tests/test_lxc_app_notification_batch.py

@@ -135,6 +135,31 @@ class AppUpdateNotificationBatchTests(unittest.TestCase):
         self.assertIn("• Docmost: 0.2 → 0.9", rendered["body"])
         self.assertIn("• Redis: 7.0 → 8.1", rendered["body"])
 
+    def test_batch_formatter_uses_slovak_runtime_messages(self):
+        data = {
+            "hostname": "HomeLAB_2",
+            "updates": [
+                {"vmid": 115, "app_name": "Redis", "installed": "7.0", "latest": "8.1"},
+                {"vmid": 100, "app_name": "AdGuard Home", "installed": "1.0", "latest": "1.1"},
+                {"vmid": 115, "app_name": "Docmost", "installed": "0.2", "latest": "0.9"},
+            ],
+        }
+
+        rendered = notification_templates.render_template(
+            "app_update_available", data, language="sk",
+        )
+
+        self.assertEqual(
+            rendered["title"],
+            "HomeLAB_2: Dostupné aktualizácie aplikácií: 3",
+        )
+        self.assertIn(
+            "Aplikácie s dostupnou novšou verziou: 3 v 2 kontajneroch LXC:",
+            rendered["body"],
+        )
+        self.assertIn("• AdGuard Home: 1.0 → 1.1", rendered["body"])
+        self.assertNotIn("application updates available", rendered["title"])
+
 
 if __name__ == "__main__":
     unittest.main()

AppImage/scripts/tests/test_notification_runtime_i18n.py

@@ -289,6 +289,29 @@ class RuntimeCatalogTests(unittest.TestCase):
         self.assertIn("Vitajte", body)
         self.assertIn("profilovú fotografiu", caption)
 
+    def test_batch_app_updates_render_from_every_runtime_catalog(self):
+        data = {
+            "hostname": "HOST-ŽILINA",
+            "updates": [
+                {"vmid": 100, "app_name": "AdGuard Home", "installed": "1.0", "latest": "1.1"},
+                {"vmid": 115, "app_name": "Redis", "installed": "7.0", "latest": "8.1"},
+            ],
+        }
+        for language in self.RUNTIME_LANGUAGES:
+            rendered = notification_templates.render_template(
+                "app_update_available", data, language=language,
+            )
+            self.assertEqual(
+                rendered["title"],
+                notification_templates.runtime_message(
+                    "appUpdates.batchTitle", language,
+                    hostname="HOST-ŽILINA", count=2,
+                ),
+                language,
+            )
+            self.assertIn("CT 100", rendered["body"], language)
+            self.assertIn("• Redis: 7.0 → 8.1", rendered["body"], language)
+
     def test_ai_disabled_telegram_receives_deterministic_slovak(self):
         class RecordingTelegram:
             def __init__(self):