diff --git a/app/(tabs)/index.tsx b/app/(tabs)/index.tsx
index 7c69237..96756a1 100644
--- a/app/(tabs)/index.tsx
+++ b/app/(tabs)/index.tsx
@@ -732,7 +732,7 @@ export default function SessionsScreen() {
               </Text>
               <TextInput
                 style={[styles.modalInput, isDark && styles.modalInputDark]}
-                placeholder={serverHome ? `${serverHome}/...` : "/path/to/project"}
+                placeholder={serverHome ? `${serverHome}/...` : t("connection.add.quick.directoryPlaceholder")}
                 placeholderTextColor={isDark ? "#666666" : "#999999"}
                 value={customDir}
                 onChangeText={(text) => {
diff --git a/app/connection/[id].tsx b/app/connection/[id].tsx
index 49701d2..8043c3e 100644
--- a/app/connection/[id].tsx
+++ b/app/connection/[id].tsx
@@ -233,7 +233,7 @@ export default function EditConnectionScreen() {
       <Text style={[styles.label, isDark && styles.labelDark]}>{t("connection.shared.serverUrl")}</Text>
       <TextInput
         style={[styles.input, isDark && styles.inputDark]}
-        placeholder="http://192.168.1.100:4096"
+        placeholder={t("connection.edit.urlPlaceholder")}
         placeholderTextColor={isDark ? "#666666" : "#999999"}
         value={url}
         onChangeText={setUrl}
@@ -246,7 +246,7 @@ export default function EditConnectionScreen() {
       <Text style={[styles.label, isDark && styles.labelDark]}>{t("connection.shared.directoryOptional")}</Text>
       <TextInput
         style={[styles.input, isDark && styles.inputDark]}
-        placeholder="/path/to/project"
+        placeholder={t("connection.add.quick.directoryPlaceholder")}
         placeholderTextColor={isDark ? "#666666" : "#999999"}
         value={directory}
         onChangeText={setDirectory}
@@ -261,7 +261,7 @@ export default function EditConnectionScreen() {
       <Text style={[styles.label, isDark && styles.labelDark]}>{t("connection.shared.username")}</Text>
       <TextInput
         style={[styles.input, isDark && styles.inputDark]}
-        placeholder="admin"
+        placeholder={t("connection.add.quick.usernamePlaceholder")}
         placeholderTextColor={isDark ? "#666666" : "#999999"}
         value={username}
         onChangeText={setUsername}
diff --git a/app/connection/add.tsx b/app/connection/add.tsx
index b861608..d40dc35 100644
--- a/app/connection/add.tsx
+++ b/app/connection/add.tsx
@@ -331,7 +331,7 @@ export default function AddConnectionScreen() {
         <View style={styles.ipRow}>
           <TextInput
             style={[styles.input, styles.ipInput, isDark && styles.inputDark]}
-            placeholder="192.168.1.100"
+            placeholder={t("connection.add.quick.ipPlaceholder")}
             placeholderTextColor={isDark ? "#666666" : "#999999"}
             value={ip}
             onChangeText={setIp}
@@ -343,7 +343,7 @@ export default function AddConnectionScreen() {
           <Text style={[styles.ipColon, isDark && styles.textDark]}>:</Text>
           <TextInput
             style={[styles.input, styles.portInput, isDark && styles.inputDark]}
-            placeholder="4096"
+            placeholder={t("connection.add.quick.portPlaceholder")}
             placeholderTextColor={isDark ? "#666666" : "#999999"}
             value={port}
             onChangeText={setPort}
@@ -479,7 +479,7 @@ export default function AddConnectionScreen() {
             <>
               <TextInput
                 style={[styles.input, isDark && styles.inputDark, { marginTop: 12 }]}
-                placeholder="your@email.com"
+                placeholder={t("connection.add.quick.emailPlaceholder")}
                 placeholderTextColor={isDark ? "#666666" : "#999999"}
                 value={waitlistEmail}
                 onChangeText={setWaitlistEmail}
@@ -610,7 +610,7 @@ export default function AddConnectionScreen() {
       <Text style={[styles.label, isDark && styles.labelDark]}>{t("connection.shared.directoryOptional")}</Text>
       <TextInput
         style={[styles.input, isDark && styles.inputDark]}
-        placeholder="/path/to/project"
+        placeholder={t("connection.add.quick.directoryPlaceholder")}
         placeholderTextColor={isDark ? "#666666" : "#999999"}
         value={directory}
         onChangeText={setDirectory}
@@ -625,7 +625,7 @@ export default function AddConnectionScreen() {
       <Text style={[styles.label, isDark && styles.labelDark]}>{t("connection.shared.username")}</Text>
       <TextInput
         style={[styles.input, isDark && styles.inputDark]}
-        placeholder="admin"
+        placeholder={t("connection.add.quick.usernamePlaceholder")}
         placeholderTextColor={isDark ? "#666666" : "#999999"}
         value={username}
         onChangeText={setUsername}
@@ -636,7 +636,7 @@ export default function AddConnectionScreen() {
       <Text style={[styles.label, isDark && styles.labelDark]}>{t("connection.shared.password")}</Text>
       <TextInput
         style={[styles.input, isDark && styles.inputDark]}
-        placeholder="password"
+        placeholder={t("connection.add.quick.passwordPlaceholder")}
         placeholderTextColor={isDark ? "#666666" : "#999999"}
         value={password}
         onChangeText={setPassword}
diff --git a/app/session/[id].tsx b/app/session/[id].tsx
index 97f885f..e7d6166 100644
--- a/app/session/[id].tsx
+++ b/app/session/[id].tsx
@@ -748,7 +748,7 @@ export default function SessionScreen() {
             onLongPress={() => cycleAgent(-1)}
           >
             <View style={[s.agentDot, { backgroundColor: agentColor }]} />
-            <Text style={[s.agentLabel, isDark && s.textWhite]}>{agent || "build"}</Text>
+            <Text style={[s.agentLabel, isDark && s.textWhite]}>{agent || t("session.agentFallback")}</Text>
             <Ionicons name="swap-horizontal-outline" size={12} color={isDark ? "#888888" : "#666666"} />
           </TouchableOpacity>
 
diff --git a/package-lock.json b/package-lock.json
index 7a846b5..7010fd3 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "@opencode-ai/mobile",
-  "version": "0.4.11",
+  "version": "0.4.15",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "@opencode-ai/mobile",
-      "version": "0.4.11",
+      "version": "0.4.15",
       "dependencies": {
         "@expo/vector-icons": "^15.0.3",
         "@gorhom/bottom-sheet": "5.2.8",
diff --git a/src/components/chat/DirectorySwitcher.tsx b/src/components/chat/DirectorySwitcher.tsx
index 314de86..a44e5f7 100644
--- a/src/components/chat/DirectorySwitcher.tsx
+++ b/src/components/chat/DirectorySwitcher.tsx
@@ -87,7 +87,7 @@ export function DirectorySwitcher({ sheetRef, current, recents, serverHome, isDa
       <View style={s.inputWrap}>
         <BottomSheetTextInput
           style={[s.input, isDark && s.inputDark]}
-          placeholder={serverHome ? `${serverHome}/...` : "/path/to/project"}
+          placeholder={serverHome ? `${serverHome}/...` : t("chat.directorySwitcher.pathPlaceholder")}
           placeholderTextColor={isDark ? "#666666" : "#999999"}
           value={custom}
           onChangeText={(text) => {
diff --git a/src/components/chat/MessageBubble.tsx b/src/components/chat/MessageBubble.tsx
index 0f82eca..4e8d38a 100644
--- a/src/components/chat/MessageBubble.tsx
+++ b/src/components/chat/MessageBubble.tsx
@@ -4,6 +4,7 @@ import { Ionicons } from "@expo/vector-icons"
 import { Markdown } from "../markdown"
 import { ToolCallCard } from "./ToolCallCard"
 import { ReasoningBlock } from "./ReasoningBlock"
+import { useTranslation } from "react-i18next"
 import type { Message, Part } from "../../lib/sdk"
 
 const SCREEN_WIDTH = Dimensions.get("window").width
@@ -26,6 +27,7 @@ interface Props {
 // built-in block-level memoization that eliminates re-renders for stable blocks
 export const MessageBubble = memo(
   function MessageBubble({ message, parts, isDark, onLongPress }: Props) {
+    const { t } = useTranslation()
     const isUser = message.role === "user"
 
     const textParts = parts.filter((p) => p.type === "text")
@@ -55,7 +57,7 @@ export const MessageBubble = memo(
             size={14}
             color={isUser ? (isDark ? "#ffffff" : "#0a0a0a") : "#8b5cf6"}
           />
-          <Text style={[s.role, isUser && s.roleUser, isDark && s.textWhite]}>{isUser ? "You" : "Assistant"}</Text>
+          <Text style={[s.role, isUser && s.roleUser, isDark && s.textWhite]}>{t("chat.messageBubble.roleYou")}</Text>
           {message.model && <Text style={[s.modelTag, isDark && s.modelTagDark]}>{message.model.modelID}</Text>}
           {!isUser && message.modelID && <Text style={[s.modelTag, isDark && s.modelTagDark]}>{message.modelID}</Text>}
         </View>
@@ -104,8 +106,8 @@ export const MessageBubble = memo(
         {/* Tokens/cost for assistant messages */}
         {!isUser && message.tokens && (
           <Text style={[s.tokens, isDark && s.tokensDark]}>
-            {message.tokens.input + message.tokens.output} tokens
-            {message.cost ? ` · $${message.cost.toFixed(4)}` : ""}
+            {message.tokens.input + message.tokens.output}{t("chat.messageBubble.tokensSuffix")}
+            {message.cost ? ` · ${t("chat.messageBubble.costPrefix")}${message.cost.toFixed(4)}` : ""}
           </Text>
         )}
       </TouchableOpacity>
diff --git a/src/components/markdown/CodeBlock.tsx b/src/components/markdown/CodeBlock.tsx
index 8265309..53fc165 100644
--- a/src/components/markdown/CodeBlock.tsx
+++ b/src/components/markdown/CodeBlock.tsx
@@ -1,6 +1,7 @@
 import { useState } from "react"
 import { View, Text, TouchableOpacity, StyleSheet, useColorScheme, Platform, ScrollView } from "react-native"
 import * as Clipboard from "expo-clipboard"
+import { useTranslation } from "react-i18next"
 import { WIDE_CONTENT_SCROLL_CONFIG } from "../../lib/scroll-config"
 
 interface Props {
@@ -9,6 +10,7 @@ interface Props {
 }
 
 export function CodeBlock({ code, language }: Props) {
+  const { t } = useTranslation()
   const isDark = useColorScheme() === "dark"
   const [copied, setCopied] = useState(false)
 
@@ -23,9 +25,9 @@ export function CodeBlock({ code, language }: Props) {
   return (
     <View style={[styles.container, isDark && styles.containerDark]}>
       <View style={[styles.header, isDark && styles.headerDark]}>
-        <Text style={[styles.language, isDark && styles.languageDark]}>{language || "code"}</Text>
+        <Text style={[styles.language, isDark && styles.languageDark]}>{language || t("common.fallbackLanguage")}</Text>
         <TouchableOpacity onPress={copy} hitSlop={8}>
-          <Text style={[styles.copyBtn, isDark && styles.copyBtnDark]}>{copied ? "Copied!" : "Copy"}</Text>
+          <Text style={[styles.copyBtn, isDark && styles.copyBtnDark]}>{copied ? t("common.copied") : t("common.copy")}</Text>
         </TouchableOpacity>
       </View>
       <ScrollView {...WIDE_CONTENT_SCROLL_CONFIG} testID="code-block-scroll" contentContainerStyle={styles.codeScroll}>
diff --git a/src/lib/i18n/en.json b/src/lib/i18n/en.json
index 13519f2..e091d4e 100644
--- a/src/lib/i18n/en.json
+++ b/src/lib/i18n/en.json
@@ -6,7 +6,10 @@
     "delete": "Delete",
     "retry": "Retry",
     "save": "Save",
-    "shareReport": "Share report"
+    "shareReport": "Share report",
+    "copy": "复制",
+    "copied": "已复制",
+    "fallbackLanguage": "代码"
   },
   "settings": {
     "sections": {
@@ -123,7 +126,8 @@
       "imageFailedMessage": "One or more images could not be processed. Please try a different photo.",
       "speechErrorTitle": "Voice input failed",
       "speechErrorMessage": "Could not use voice input. Check your microphone permission and try again."
-    }
+    },
+    "agentFallback": "build"
   },
   "connection": {
     "shared": {
@@ -159,7 +163,7 @@
         "nameOptionalLabel": "Name (optional)",
         "namePlaceholder": "My Mac",
         "passwordIfSetLabel": "Password (if set on server)",
-        "passwordPlaceholder": "Leave empty if none",
+        "passwordPlaceholder": "password",
         "usernameHintPrefix": "Username defaults to ",
         "usernameHintMiddle": ". Custom username? Use ",
         "usernameHintSuffix": ".",
@@ -175,7 +179,15 @@
         "connectCardTitle": "OpenCode Connect",
         "connectCardBadge": "Coming Soon",
         "connectCardDesc": "Bridge your phone to your opencode server — no tunnel setup, no firewall config. One-tap connect from anywhere.",
-        "advancedLink": "Advanced options (tunnels, cloud, auth)"
+        "advancedLink": "Advanced options (tunnels, cloud, auth)",
+        "ipPlaceholder": "192.168.1.100",
+        "portPlaceholder": "4096",
+        "emailPlaceholder": "your@email.com",
+        "urlPlaceholderLocal": "http://192.168.1.100:4096",
+        "urlPlaceholderTunnel": "https://your-tunnel.trycloudflare.com",
+        "urlPlaceholderCloud": "https://api.opencode.ai",
+        "directoryPlaceholder": "/path/to/project",
+        "usernamePlaceholder": "admin"
       },
       "waitlist": {
         "successText": "You're on the list — we'll email you when OpenCode Connect is ready.",
@@ -215,7 +227,8 @@
         "noDetail": "no detail",
         "deleteTitle": "Delete Connection",
         "deleteMessage": "Are you sure you want to delete \"{{name}}\"?"
-      }
+      },
+      "urlPlaceholder": "http://192.168.1.100:4096"
     }
   },
   "nav": {
@@ -388,7 +401,8 @@
       "serverDefaultLabel": "Server Default",
       "browseLabel": "Browse…",
       "recentProjectsLabel": "Recent Projects",
-      "usesServerDir": "Uses server's working directory"
+      "usesServerDir": "Uses server's working directory",
+      "pathPlaceholder": "请输入路径..."
     },
     "directoryBrowserSheet": {
       "noActiveConnection": "No active connection",
@@ -434,6 +448,12 @@
         "hoursAgo": "{{count}}h ago",
         "daysAgo": "{{count}}d ago"
       }
+    },
+    "messageBubble": {
+      "roleYou": "你",
+      "roleAssistant": "AI 助手",
+      "tokensSuffix": " tokens",
+      "costPrefix": "$"
     }
   },
   "demo": {
@@ -452,4 +472,4 @@
     "dismiss": "Not now",
     "upToDate": "Up to date"
   }
-}
+}
\ No newline at end of file
diff --git a/src/lib/i18n/zh-Hans.json b/src/lib/i18n/zh-Hans.json
index 9ba906f..91678f9 100644
--- a/src/lib/i18n/zh-Hans.json
+++ b/src/lib/i18n/zh-Hans.json
@@ -6,7 +6,10 @@
     "delete": "删除",
     "retry": "重试",
     "save": "保存",
-    "shareReport": "分享报告"
+    "shareReport": "分享报告",
+    "copy": "复制",
+    "copied": "已复制",
+    "fallbackLanguage": "代码"
   },
   "settings": {
     "sections": {
@@ -123,7 +126,8 @@
       "imageFailedMessage": "一张或多张图片无法处理。请尝试其他照片。",
       "speechErrorTitle": "语音输入失败",
       "speechErrorMessage": "无法使用语音输入。请检查麦克风权限后重试。"
-    }
+    },
+    "agentFallback": "build"
   },
   "connection": {
     "shared": {
@@ -159,7 +163,7 @@
         "nameOptionalLabel": "名称（可选）",
         "namePlaceholder": "我的 Mac",
         "passwordIfSetLabel": "密码（如服务器已设置）",
-        "passwordPlaceholder": "留空表示无密码",
+        "passwordPlaceholder": "password",
         "usernameHintPrefix": "用户名默认为 ",
         "usernameHintMiddle": "。需要自定义用户名？请使用",
         "usernameHintSuffix": "。",
@@ -175,7 +179,15 @@
         "connectCardTitle": "OpenCode Connect",
         "connectCardBadge": "即将上线",
         "connectCardDesc": "将手机桥接到您的 opencode 服务器 — 无需配置隧道或防火墙。一键连接，随时随地。",
-        "advancedLink": "高级选项（隧道、云端、身份验证）"
+        "advancedLink": "高级选项（隧道、云端、身份验证）",
+        "ipPlaceholder": "192.168.1.100",
+        "portPlaceholder": "4096",
+        "emailPlaceholder": "your@email.com",
+        "urlPlaceholderLocal": "http://192.168.1.100:4096",
+        "urlPlaceholderTunnel": "https://your-tunnel.trycloudflare.com",
+        "urlPlaceholderCloud": "https://api.opencode.ai",
+        "directoryPlaceholder": "/path/to/project",
+        "usernamePlaceholder": "admin"
       },
       "waitlist": {
         "successText": "您已加入候补名单 — OpenCode Connect 准备就绪时我们会通过邮件通知您。",
@@ -215,7 +227,8 @@
         "noDetail": "无详细信息",
         "deleteTitle": "删除连接",
         "deleteMessage": "确定要删除 \"{{name}}\" 吗？"
-      }
+      },
+      "urlPlaceholder": "http://192.168.1.100:4096"
     }
   },
   "nav": {
@@ -388,7 +401,8 @@
       "serverDefaultLabel": "服务器默认",
       "browseLabel": "浏览…",
       "recentProjectsLabel": "最近项目",
-      "usesServerDir": "使用服务器的工作目录"
+      "usesServerDir": "使用服务器的工作目录",
+      "pathPlaceholder": "请输入路径..."
     },
     "directoryBrowserSheet": {
       "noActiveConnection": "没有活动连接",
@@ -434,6 +448,12 @@
         "hoursAgo": "{{count}} 小时前",
         "daysAgo": "{{count}} 天前"
       }
+    },
+    "messageBubble": {
+      "roleYou": "你",
+      "roleAssistant": "AI 助手",
+      "tokensSuffix": " tokens",
+      "costPrefix": "$"
     }
   },
   "demo": {
@@ -452,4 +472,4 @@
     "dismiss": "暂不",
     "upToDate": "已是最新"
   }
-}
+}
\ No newline at end of file