diff --git a/apps/web/messages/en.json b/apps/web/messages/en.json
index b28d6f29a..1f1d50ffc 100644
--- a/apps/web/messages/en.json
+++ b/apps/web/messages/en.json
@@ -34,40 +34,40 @@
     "environment": "Production"
   },
   "nav": {
-    "home": "Home",
-    "dashboard": "Dashboard",
-    "approvals": "Approvals",
-    "errors": "Error Tracking",
-    "actions": "Action Log",
-    "knowledge": "Knowledge Base",
-    "settings": "Settings",
-    "alerts": "Alerts",
-    "monitoring": "Monitoring",
+    "home": "首頁",
+    "dashboard": "儀表板",
+    "approvals": "授權中心",
+    "errors": "錯誤追蹤",
+    "actions": "行動日誌",
+    "knowledge": "知識殿堂",
+    "settings": "設定",
+    "alerts": "告警",
+    "monitoring": "服務監控",
     "apm": "APM",
-    "topology": "Topology",
-    "security": "Security",
-    "compliance": "Compliance",
-    "autoRepair": "Auto Repair",
-    "deployments": "Deployments",
-    "tickets": "Tickets",
-    "cost": "Cost",
-    "reports": "Reports",
-    "terminal": "Terminal",
-    "apps": "Apps",
-    "services": "Services",
-    "users": "Users",
-    "notifications": "Notifications",
-    "billing": "Billing",
-    "help": "Help",
-    "drift": "Drift Detection",
-    "neuralCommand": "Neural Command",
-    "commandCenter": "Command Center",
-    "observability": "Observability",
-    "automation": "Automation",
-    "operations": "Operations",
-    "securityCompliance": "Security & Compliance",
-    "classicAICenter": "Classic AI Center",
-    "governance": "AI Governance",
+    "topology": "拓撲圖",
+    "security": "安全",
+    "compliance": "合規",
+    "autoRepair": "自動修復",
+    "deployments": "部署管理",
+    "tickets": "工單",
+    "cost": "成本分析",
+    "reports": "報表",
+    "terminal": "終端",
+    "apps": "應用",
+    "services": "服務目錄",
+    "users": "使用者",
+    "notifications": "通知",
+    "billing": "帳單",
+    "help": "說明",
+    "drift": "漂移偵測",
+    "neuralCommand": "神經指揮中心",
+    "commandCenter": "指令中心",
+    "observability": "可觀測性",
+    "automation": "自動化",
+    "operations": "營運",
+    "securityCompliance": "安全合規",
+    "classicAICenter": "經典 AI 中心",
+    "governance": "AI 治理",
     "awooop": "AwoooP",
     "iwooos": "IwoooS",
     "iwooosSecurityCompliance": "IwoooS 安全合規"
diff --git a/docs/LOGBOOK.md b/docs/LOGBOOK.md
index cf256e95d..88ed23237 100644
--- a/docs/LOGBOOK.md
+++ b/docs/LOGBOOK.md
@@ -1,3 +1,44 @@
+## 2026-05-31｜側邊欄 nav 全語系繁體中文收斂
+
+**背景**：
+
+- 使用者要求所有網站內容都必須以繁體中文呈現。
+- 前一輪已把「安全合規」與「IwoooS」整合成單一側邊欄入口，但 `/en` 語系的側邊欄仍會出現 `Command Center`、`Security & Compliance`、`Classic AI Center` 等英文菜單。
+
+**本次調整**：
+
+- `apps/web/messages/en.json` 的 `nav` 區塊改為完整鏡像 `zh-TW.json`，即使進入 `/en` 路由，側邊欄仍顯示繁體中文。
+- 保留產品 / 技術名詞：`APM`、`AI`、`AwoooP`、`IwoooS`。
+- `security-mirror-progress-guard.py` 新增 `web_messages.en.nav.traditional_chinese_mirror`，避免後續把側邊欄菜單改回英文。
+
+**驗證**：
+
+```text
+python3 -m json.tool apps/web/messages/en.json
+  -> pass
+python3 -m py_compile scripts/security/security-mirror-progress-guard.py scripts/security/source-control-owner-response-guard.py
+  -> pass
+python3 scripts/security/security-mirror-progress-guard.py
+  -> SECURITY_MIRROR_PROGRESS_GUARD_OK
+python3 scripts/security/source-control-owner-response-guard.py
+  -> SOURCE_CONTROL_OWNER_RESPONSE_GUARD_OK
+pnpm --dir apps/web exec tsc --noEmit --tsBuildInfoFile /tmp/awoooi-iwooos-nav-language-20260531.tsbuildinfo
+  -> pass
+NEXT_PUBLIC_API_URL=https://awoooi.wooo.work pnpm --dir apps/web run build
+  -> pass
+本地 Playwright（production build / next start）:
+  /en/iwooos 桌機 1280px -> 側邊欄顯示指令中心 / 可觀測性 / 自動化 / 營運 / IwoooS 安全合規 / 知識殿堂 / AI 治理 / AwoooP / 經典 AI 中心 / 終端 / 設定；無英文菜單；無水平溢出
+  /en/security-compliance 桌機 1280px -> 同上，且 IwoooS 安全合規入口透過路由別名高亮；無 /en/security-compliance 重複菜單 href
+  /en/iwooos 手機 390px -> 單一 /en/iwooos 側邊欄入口高亮；無水平溢出
+  /en/security-compliance 手機 390px -> 單一 /en/iwooos 側邊欄入口透過路由別名高亮；無水平溢出
+```
+
+**進度邊界**：
+
+- 整體資安網仍維持 `61%`。
+- 本輪只處理高可見度導覽語言一致性，不是執行期強制控管。
+- active runtime gate 仍為 `0`；沒有新增掃描、SSH、主機更新、修復、批准、部署按鈕或 GitHub primary 切換。
+
 ## 2026-05-31｜IwoooS 與安全合規側邊欄入口整合
 
 **背景**：
diff --git a/scripts/security/security-mirror-progress-guard.py b/scripts/security/security-mirror-progress-guard.py
index c6d2a859b..22a6fa175 100755
--- a/scripts/security/security-mirror-progress-guard.py
+++ b/scripts/security/security-mirror-progress-guard.py
@@ -216,6 +216,7 @@ def validate(root: Path) -> None:
         web_messages_en["nav"]["iwooosSecurityCompliance"],
         "IwoooS 安全合規",
     )
+    assert_equal("web_messages.en.nav.traditional_chinese_mirror", web_messages_en["nav"], web_messages_zh["nav"])
 
     progress = rollup["progress_estimate"]
     assert_equal("progress.overall_percent", progress["overall_percent"], 61)