diff --git a/components/ChatInput.tsx b/components/ChatInput.tsx
index babcefe850..45a94e6944 100644
--- a/components/ChatInput.tsx
+++ b/components/ChatInput.tsx
@@ -565,6 +565,7 @@ function QueuedMessageRow({ kind, text }: { kind: "steer" | "follow-up"; text: s
 }
 
 function ModelNoticeBanner({ tone, title, body, onClose }: { tone: "error" | "warning"; title: string; body: string; onClose?: () => void }) {
+  const { t } = useI18n();
   const color = tone === "error" ? "239,68,68" : "234,179,8";
   return (
     <div
@@ -609,7 +610,7 @@ function ModelNoticeBanner({ tone, title, body, onClose }: { tone: "error" | "wa
         <button
           type="button"
           onClick={onClose}
-          aria-label="Dismiss"
+          aria-label={t("sidebar.dismiss")}
           style={{
             flexShrink: 0,
             background: "none",
diff --git a/components/MessageView.tsx b/components/MessageView.tsx
index 78ff10777b..7db852ecdf 100644
--- a/components/MessageView.tsx
+++ b/components/MessageView.tsx
@@ -946,7 +946,7 @@ function AssistantMessageView({
         {(message.usage || turnDurationMs !== undefined) && !isStreaming && (
           <div style={{ fontSize: 11, color: "var(--text-dim)" }}>
             {[
-              message.usage ? formatUsage(message.usage) : null,
+              message.usage ? formatUsage(message.usage, t) : null,
               turnDurationMs !== undefined ? t("chat.turnDuration", { time: formatTurnDuration(turnDurationMs) }) : null,
             ].filter(Boolean).join(" \u00b7 ")}
           </div>
@@ -2225,17 +2225,18 @@ function formatUsage(usage: {
   cacheRead: number;
   cacheWrite: number;
   cost: { total: number };
-}): string {
+}, t: (key: string, params?: Record<string, string | number>) => string): string {
   const parts = [];
-  if (usage.input) parts.push(`${usage.input.toLocaleString()} in`);
-  if (usage.output) parts.push(`${usage.output.toLocaleString()} out`);
-  if (usage.cacheRead) parts.push(`${usage.cacheRead.toLocaleString()} cache R`);
-  if (usage.cacheWrite) parts.push(`${usage.cacheWrite.toLocaleString()} cache W`);
+  if (usage.input) parts.push(t("chat.usageInput", { count: usage.input.toLocaleString() }));
+  if (usage.output) parts.push(t("chat.usageOutput", { count: usage.output.toLocaleString() }));
+  if (usage.cacheRead) parts.push(t("chat.usageCacheRead", { count: usage.cacheRead.toLocaleString() }));
+  if (usage.cacheWrite) parts.push(t("chat.usageCacheWrite", { count: usage.cacheWrite.toLocaleString() }));
   if (usage.cost?.total) parts.push(`$${usage.cost.total.toFixed(4)}`);
   return parts.join(" · ");
 }
 
 function BashExecutionView({ message, sessionId }: { message: BashExecutionMessage; sessionId?: string }) {
+  const { t } = useI18n();
   const [fullOutput, setFullOutput] = useState<string | null>(null);
   const [loadingFull, setLoadingFull] = useState(false);
   const [fullError, setFullError] = useState<string | null>(null);
@@ -2299,14 +2300,14 @@ function BashExecutionView({ message, sessionId }: { message: BashExecutionMessa
               disabled={loadingFull}
               style={{ background: "none", border: "none", color: "var(--accent)", cursor: loadingFull ? "default" : "pointer", fontSize: 11, padding: 0, textDecoration: "underline" }}
             >
-              {loadingFull ? "loading…" : "view full output"}
+              {loadingFull ? t("chat.loadingFullOutput") : t("chat.viewFullOutput")}
             </button>
           )}
           <a
             href={`${fullOutputUrl}&download=1`}
             style={{ marginLeft: showFullButton ? 10 : 0, color: "var(--accent)", fontSize: 11, textDecoration: "underline" }}
           >
-            download full output
+            {t("chat.downloadFullOutput")}
           </a>
           {fullError && <span style={{ marginLeft: 6, color: "var(--text-dim)", fontSize: 11 }}>({fullError})</span>}
         </div>
diff --git a/lib/i18n/messages/en.ts b/lib/i18n/messages/en.ts
index cd3d53ef39..90d0889ea9 100644
--- a/lib/i18n/messages/en.ts
+++ b/lib/i18n/messages/en.ts
@@ -500,6 +500,13 @@ export const enLocale: LocalePlugin = {
     "chat.toolCall": "tool call",
     "chat.toolCalls": "tool calls",
     "chat.turnDuration": "took {time}",
+    "chat.usageInput": "{count} in",
+    "chat.usageOutput": "{count} out",
+    "chat.usageCacheRead": "{count} cache R",
+    "chat.usageCacheWrite": "{count} cache W",
+    "chat.viewFullOutput": "view full output",
+    "chat.loadingFullOutput": "loading…",
+    "chat.downloadFullOutput": "download full output",
     "chat.collapseProcess": "Collapse process details",
     "chat.expandProcess": "Expand process details",
     "transcriptNotice.costSuffix": " (~{cost})",
diff --git a/lib/i18n/messages/zh-CN.ts b/lib/i18n/messages/zh-CN.ts
index bb1c64868e..7f8a6630a4 100644
--- a/lib/i18n/messages/zh-CN.ts
+++ b/lib/i18n/messages/zh-CN.ts
@@ -500,6 +500,13 @@ export const zhCNLocale: LocalePlugin = {
     "chat.toolCall": "次工具调用",
     "chat.toolCalls": "次工具调用",
     "chat.turnDuration": "耗时 {time}",
+    "chat.usageInput": "输入 {count}",
+    "chat.usageOutput": "输出 {count}",
+    "chat.usageCacheRead": "缓存读取 {count}",
+    "chat.usageCacheWrite": "缓存写入 {count}",
+    "chat.viewFullOutput": "查看完整输出",
+    "chat.loadingFullOutput": "加载中…",
+    "chat.downloadFullOutput": "下载完整输出",
     "chat.collapseProcess": "收起处理详情",
     "chat.expandProcess": "展开处理详情",
     "transcriptNotice.costSuffix": "（约 {cost}）",
diff --git a/lib/i18n/messages/zh-TW.ts b/lib/i18n/messages/zh-TW.ts
index fe29c7f3bc..444feeba7b 100644
--- a/lib/i18n/messages/zh-TW.ts
+++ b/lib/i18n/messages/zh-TW.ts
@@ -500,6 +500,13 @@ export const zhTWLocale: LocalePlugin = {
     "chat.toolCall": "次工具呼叫",
     "chat.toolCalls": "次工具呼叫",
     "chat.turnDuration": "耗時 {time}",
+    "chat.usageInput": "輸入 {count}",
+    "chat.usageOutput": "輸出 {count}",
+    "chat.usageCacheRead": "快取讀取 {count}",
+    "chat.usageCacheWrite": "快取寫入 {count}",
+    "chat.viewFullOutput": "檢視完整輸出",
+    "chat.loadingFullOutput": "載入中…",
+    "chat.downloadFullOutput": "下載完整輸出",
     "chat.collapseProcess": "收起處理詳細資料",
     "chat.expandProcess": "展開處理詳細資料",
     "transcriptNotice.costSuffix": "（約 {cost}）",