diff --git a/frontend/src/pages/xray/routing/RuleCardList.tsx b/frontend/src/pages/xray/routing/RuleCardList.tsx
index ffa43c267..50f2e925c 100644
--- a/frontend/src/pages/xray/routing/RuleCardList.tsx
+++ b/frontend/src/pages/xray/routing/RuleCardList.tsx
@@ -152,9 +152,7 @@ export default function RuleCardList({
               <span className="flow-arrow">→</span>
               <div className="flow-side flow-side-target">
                 <span className="flow-label">
-                  {rule.balancerTag
-                    ? t('pages.xray.balancer') || 'Balancer'
-                    : t('pages.xray.Outbounds')}
+                  {rule.balancerTag ? t('pages.xray.rules.balancer') : t('pages.xray.Outbounds')}
                 </span>
                 {rule.outboundTag ? (
                   <Tag color="green" className="flow-tag">
diff --git a/frontend/src/test/i18n-dead-keys.test.ts b/frontend/src/test/i18n-dead-keys.test.ts
index a8b595f64..002849c57 100644
--- a/frontend/src/test/i18n-dead-keys.test.ts
+++ b/frontend/src/test/i18n-dead-keys.test.ts
@@ -5,7 +5,7 @@ import { join, resolve } from 'node:path';
 import { describe, expect, it } from 'vitest';
 
 /*
- * Guards the 14-locale translation set two ways: every key in en-US must be
+ * Guards the 14-locale translation set: every key in en-US must be
  * referenced somewhere in the frontend or Go sources (dead keys accumulate
  * silently — this test deleted over two hundred of them when it was
  * introduced), and every locale must carry exactly the en-US key set
@@ -82,6 +82,17 @@ describe('i18n keys', () => {
     );
   });
 
+  it('no literal t() key resolves to an object', () => {
+    const objectKeys = Array.from(
+      blob.matchAll(/\bt\(\s*(['"`])([\w.-]+)\1\s*[,)]/g),
+      (m) => m[2],
+    ).filter((key) => enKeys.some((leaf) => leaf.startsWith(`${key}.`)));
+    expect(
+      objectKeys,
+      `t() keys naming a group, rendered as "key '…' returned an object instead of string.":\n  ${objectKeys.join('\n  ')}`,
+    ).toEqual([]);
+  });
+
   it('every locale carries exactly the en-US key set', () => {
     const enSet = new Set(enKeys);
     for (const file of readdirSync(translationDir)) {