diff --git a/src/App.tsx b/src/App.tsx
index 25835f1..5624347 100644
--- a/src/App.tsx
+++ b/src/App.tsx
@@ -142,7 +142,7 @@ function App() {
             </Button>
             <Button onClick={() => setIsAddOpen(true)}>
               <Plus className="h-4 w-4" />
-              {t("header.addProvider", { defaultValue: "添加供应商" })}
+              {t("header.addProvider")}
             </Button>
           </div>
         </div>
@@ -198,12 +198,11 @@ function App() {
 
       <ConfirmDialog
         isOpen={Boolean(confirmDelete)}
-        title={t("confirm.deleteProvider", { defaultValue: "删除供应商" })}
+        title={t("confirm.deleteProvider")}
         message={
           confirmDelete
             ? t("confirm.deleteProviderMessage", {
                 name: confirmDelete.name,
-                defaultValue: `确定删除 ${confirmDelete.name} 吗？`,
               })
             : ""
         }
diff --git a/src/components/UsageFooter.tsx b/src/components/UsageFooter.tsx
index 1241335..d39c277 100644
--- a/src/components/UsageFooter.tsx
+++ b/src/components/UsageFooter.tsx
@@ -1,5 +1,6 @@
 import React from "react";
 import { RefreshCw, AlertCircle } from "lucide-react";
+import { useTranslation } from "react-i18next";
 import { type AppType } from "@/lib/api";
 import { useUsageQuery } from "@/lib/query/queries";
 import { UsageData } from "../types";
@@ -15,6 +16,7 @@ const UsageFooter: React.FC<UsageFooterProps> = ({
   appType,
   usageEnabled,
 }) => {
+  const { t } = useTranslation();
   const {
     data: usage,
     isLoading: loading,
@@ -31,7 +33,7 @@ const UsageFooter: React.FC<UsageFooterProps> = ({
         <div className="flex items-center justify-between gap-2 text-xs">
           <div className="flex items-center gap-2 text-red-500 dark:text-red-400">
             <AlertCircle size={14} />
-            <span>{usage.error || "查询失败"}</span>
+            <span>{usage.error || t("usage.queryFailed")}</span>
           </div>
 
           {/* 刷新按钮 */}
@@ -39,7 +41,7 @@ const UsageFooter: React.FC<UsageFooterProps> = ({
             onClick={() => refetch()}
             disabled={loading}
             className="p-1 rounded hover:bg-gray-100 dark:hover:bg-gray-800 transition-colors disabled:opacity-50 flex-shrink-0"
-            title="刷新用量"
+            title={t("usage.refreshUsage")}
           >
             <RefreshCw size={12} className={loading ? "animate-spin" : ""} />
           </button>
@@ -58,13 +60,13 @@ const UsageFooter: React.FC<UsageFooterProps> = ({
       {/* 标题行：包含刷新按钮 */}
       <div className="flex items-center justify-between mb-2">
         <span className="text-xs text-gray-500 dark:text-gray-400 font-medium">
-          套餐用量
+          {t("usage.planUsage")}
         </span>
         <button
           onClick={() => refetch()}
           disabled={loading}
           className="p-1 rounded hover:bg-gray-100 dark:hover:bg-gray-800 transition-colors disabled:opacity-50"
-          title="刷新用量"
+          title={t("usage.refreshUsage")}
         >
           <RefreshCw size={12} className={loading ? "animate-spin" : ""} />
         </button>
@@ -82,6 +84,7 @@ const UsageFooter: React.FC<UsageFooterProps> = ({
 
 // 单个套餐数据展示组件
 const UsagePlanItem: React.FC<{ data: UsageData }> = ({ data }) => {
+  const { t } = useTranslation();
   const {
     planName,
     extra,
@@ -130,7 +133,7 @@ const UsagePlanItem: React.FC<{ data: UsageData }> = ({ data }) => {
         )}
         {isExpired && (
           <span className="text-red-500 dark:text-red-400 font-medium text-[10px] px-1.5 py-0.5 bg-red-50 dark:bg-red-900/20 rounded flex-shrink-0">
-            {invalidMessage || "已失效"}
+            {invalidMessage || t("usage.invalid")}
           </span>
         )}
       </div>
@@ -143,7 +146,7 @@ const UsagePlanItem: React.FC<{ data: UsageData }> = ({ data }) => {
         {/* 总额度 */}
         {total !== undefined && (
           <>
-            <span className="text-gray-500 dark:text-gray-400">总：</span>
+            <span className="text-gray-500 dark:text-gray-400">{t("usage.total")}</span>
             <span className="tabular-nums text-gray-600 dark:text-gray-400">
               {total === -1 ? "∞" : total.toFixed(2)}
             </span>
@@ -154,7 +157,7 @@ const UsagePlanItem: React.FC<{ data: UsageData }> = ({ data }) => {
         {/* 已用额度 */}
         {used !== undefined && (
           <>
-            <span className="text-gray-500 dark:text-gray-400">使用：</span>
+            <span className="text-gray-500 dark:text-gray-400">{t("usage.used")}</span>
             <span className="tabular-nums text-gray-600 dark:text-gray-400">
               {used.toFixed(2)}
             </span>
@@ -165,7 +168,7 @@ const UsagePlanItem: React.FC<{ data: UsageData }> = ({ data }) => {
         {/* 剩余额度 - 突出显示 */}
         {remaining !== undefined && (
           <>
-            <span className="text-gray-500 dark:text-gray-400">剩余：</span>
+            <span className="text-gray-500 dark:text-gray-400">{t("usage.remaining")}</span>
             <span
               className={`font-semibold tabular-nums ${
                 isExpired
diff --git a/src/components/UsageScriptModal.tsx b/src/components/UsageScriptModal.tsx
index ee79a06..e42133e 100644
--- a/src/components/UsageScriptModal.tsx
+++ b/src/components/UsageScriptModal.tsx
@@ -1,6 +1,7 @@
 import React, { useState } from "react";
 import { Play, Wand2 } from "lucide-react";
 import { toast } from "sonner";
+import { useTranslation } from "react-i18next";
 import { Provider, UsageScript } from "../types";
 import { usageApi, type AppType } from "@/lib/api";
 import JsonEditor from "./JsonEditor";
@@ -88,12 +89,13 @@ const UsageScriptModal: React.FC<UsageScriptModalProps> = ({
   onClose,
   onSave,
 }) => {
+  const { t } = useTranslation();
   const [script, setScript] = useState<UsageScript>(() => {
     return (
       provider.meta?.usage_script || {
         enabled: false,
         language: "javascript",
-        code: PRESET_TEMPLATES["通用模板"],
+        code: PRESET_TEMPLATES[t("usageScript.presetTemplate") === "预设模板" ? "通用模板" : "General"],
         timeout: 10,
       }
     );
@@ -104,13 +106,13 @@ const UsageScriptModal: React.FC<UsageScriptModalProps> = ({
   const handleSave = () => {
     // 验证脚本格式
     if (script.enabled && !script.code.trim()) {
-      toast.error("脚本配置不能为空");
+      toast.error(t("usageScript.scriptEmpty"));
       return;
     }
 
     // 基本的 JS 语法检查（检查是否包含 return 语句）
     if (script.enabled && !script.code.includes("return")) {
-      toast.error("脚本必须包含 return 语句", { duration: 5000 });
+      toast.error(t("usageScript.mustHaveReturn"), { duration: 5000 });
       return;
     }
 
@@ -127,17 +129,17 @@ const UsageScriptModal: React.FC<UsageScriptModalProps> = ({
         const summary = result.data
           .map((plan) => {
             const planInfo = plan.planName ? `[${plan.planName}]` : "";
-            return `${planInfo} 剩余: ${plan.remaining} ${plan.unit}`;
+            return `${planInfo} ${t("usage.remaining")} ${plan.remaining} ${plan.unit}`;
           })
           .join(", ");
-        toast.success(`测试成功！${summary}`, { duration: 3000 });
+        toast.success(`${t("usageScript.testSuccess")}${summary}`, { duration: 3000 });
       } else {
-        toast.error(`测试失败: ${result.error || "无数据返回"}`, {
+        toast.error(`${t("usageScript.testFailed")}: ${result.error || t("endpointTest.noResult")}`, {
           duration: 5000,
         });
       }
     } catch (error: any) {
-      toast.error(`测试失败: ${error?.message || "未知错误"}`, {
+      toast.error(`${t("usageScript.testFailed")}: ${error?.message || t("common.unknown")}`, {
         duration: 5000,
       });
     } finally {
@@ -156,9 +158,9 @@ const UsageScriptModal: React.FC<UsageScriptModalProps> = ({
         printWidth: 80,
       });
       setScript({ ...script, code: formatted.trim() });
-      toast.success("格式化成功", { duration: 1000 });
+      toast.success(t("usageScript.formatSuccess"), { duration: 1000 });
     } catch (error: any) {
-      toast.error(`格式化失败: ${error?.message || "语法错误"}`, {
+      toast.error(`${t("usageScript.formatFailed")}: ${error?.message || t("jsonEditor.invalidJson")}`, {
         duration: 3000,
       });
     }
@@ -175,7 +177,7 @@ const UsageScriptModal: React.FC<UsageScriptModalProps> = ({
     <Dialog open={isOpen} onOpenChange={(open) => !open && onClose()}>
       <DialogContent className="max-w-3xl max-h-[90vh] flex flex-col">
         <DialogHeader>
-          <DialogTitle>配置用量查询 - {provider.name}</DialogTitle>
+          <DialogTitle>{t("usageScript.title")} - {provider.name}</DialogTitle>
         </DialogHeader>
 
         {/* Content - Scrollable */}
@@ -191,7 +193,7 @@ const UsageScriptModal: React.FC<UsageScriptModalProps> = ({
               className="w-4 h-4"
             />
             <span className="text-sm font-medium text-gray-900 dark:text-gray-100">
-              启用用量查询
+              {t("usageScript.enableUsageQuery")}
             </span>
           </label>
 
@@ -200,7 +202,7 @@ const UsageScriptModal: React.FC<UsageScriptModalProps> = ({
               {/* 预设模板选择 */}
               <div>
                 <label className="block text-sm font-medium mb-2 text-gray-900 dark:text-gray-100">
-                  预设模板
+                  {t("usageScript.presetTemplate")}
                 </label>
                 <div className="flex gap-2">
                   {Object.keys(PRESET_TEMPLATES).map((name) => (
@@ -218,7 +220,7 @@ const UsageScriptModal: React.FC<UsageScriptModalProps> = ({
               {/* 脚本编辑器 */}
               <div>
                 <label className="block text-sm font-medium mb-2 text-gray-900 dark:text-gray-100">
-                  查询脚本（JavaScript）
+                  {t("usageScript.queryScript")}
                 </label>
                 <JsonEditor
                   value={script.code}
@@ -227,9 +229,10 @@ const UsageScriptModal: React.FC<UsageScriptModalProps> = ({
                   language="javascript"
                 />
                 <p className="mt-2 text-xs text-gray-500 dark:text-gray-400">
-                  支持变量: <code>{"{{apiKey}}"}</code>,{" "}
-                  <code>{"{{baseUrl}}"}</code> | extractor 函数接收 API 响应的
-                  JSON 对象
+                  {t("usageScript.variablesHint", {
+                    apiKey: "{{apiKey}}",
+                    baseUrl: "{{baseUrl}}"
+                  })}
                 </p>
               </div>
 
@@ -237,7 +240,7 @@ const UsageScriptModal: React.FC<UsageScriptModalProps> = ({
               <div className="grid grid-cols-2 gap-4">
                 <label className="block">
                   <span className="text-sm font-medium text-gray-900 dark:text-gray-100">
-                    超时时间（秒）
+                    {t("usageScript.timeoutSeconds")}
                   </span>
                   <input
                     type="number"
@@ -257,10 +260,10 @@ const UsageScriptModal: React.FC<UsageScriptModalProps> = ({
 
               {/* 脚本说明 */}
               <div className="p-4 bg-blue-50 dark:bg-blue-900/20 rounded-lg text-sm text-gray-700 dark:text-gray-300">
-                <h4 className="font-medium mb-2">脚本编写说明：</h4>
+                <h4 className="font-medium mb-2">{t("usageScript.scriptHelp")}</h4>
                 <div className="space-y-3 text-xs">
                   <div>
-                    <strong>配置格式：</strong>
+                    <strong>{t("usageScript.configFormat")}</strong>
                     <pre className="mt-1 p-2 bg-white/50 dark:bg-black/20 rounded text-[10px] overflow-x-auto">
                       {`({
   request: {
@@ -285,51 +288,25 @@ const UsageScriptModal: React.FC<UsageScriptModalProps> = ({
                   </div>
 
                   <div>
-                    <strong>extractor 返回格式（所有字段均为可选）：</strong>
+                    <strong>{t("usageScript.extractorFormat")}</strong>
                     <ul className="mt-1 space-y-0.5 ml-2">
-                      <li>
-                        • <code>isValid</code>: 布尔值，套餐是否有效
-                      </li>
-                      <li>
-                        • <code>invalidMessage</code>: 字符串，失效原因说明（当
-                        isValid 为 false 时显示）
-                      </li>
-                      <li>
-                        • <code>remaining</code>: 数字，剩余额度
-                      </li>
-                      <li>
-                        • <code>unit</code>: 字符串，单位（如 "USD"）
-                      </li>
-                      <li>
-                        • <code>planName</code>: 字符串，套餐名称
-                      </li>
-                      <li>
-                        • <code>total</code>: 数字，总额度
-                      </li>
-                      <li>
-                        • <code>used</code>: 数字，已用额度
-                      </li>
-                      <li>
-                        • <code>extra</code>:
-                        字符串，扩展字段，可自由补充需要展示的文本
-                      </li>
+                      <li>{t("usageScript.fieldIsValid")}</li>
+                      <li>{t("usageScript.fieldInvalidMessage")}</li>
+                      <li>{t("usageScript.fieldRemaining")}</li>
+                      <li>{t("usageScript.fieldUnit")}</li>
+                      <li>{t("usageScript.fieldPlanName")}</li>
+                      <li>{t("usageScript.fieldTotal")}</li>
+                      <li>{t("usageScript.fieldUsed")}</li>
+                      <li>{t("usageScript.fieldExtra")}</li>
                     </ul>
                   </div>
 
                   <div className="text-gray-600 dark:text-gray-400">
-                    <strong>💡 提示：</strong>
+                    <strong>{t("usageScript.tips")}</strong>
                     <ul className="mt-1 space-y-0.5 ml-2">
-                      <li>
-                        • 变量 <code>{"{{apiKey}}"}</code> 和{" "}
-                        <code>{"{{baseUrl}}"}</code> 会自动替换
-                      </li>
-                      <li>
-                        • extractor 函数在沙箱环境中执行，支持 ES2020+ 语法
-                      </li>
-                      <li>
-                        • 整个配置必须用 <code>()</code>{" "}
-                        包裹，形成对象字面量表达式
-                      </li>
+                      <li>{t("usageScript.tip1", { apiKey: "{{apiKey}}", baseUrl: "{{baseUrl}}" })}</li>
+                      <li>{t("usageScript.tip2")}</li>
+                      <li>{t("usageScript.tip3")}</li>
                     </ul>
                   </div>
                 </div>
@@ -349,27 +326,27 @@ const UsageScriptModal: React.FC<UsageScriptModalProps> = ({
               disabled={!script.enabled || testing}
             >
               <Play size={14} />
-              {testing ? "测试中..." : "测试脚本"}
+              {testing ? t("usageScript.testing") : t("usageScript.testScript")}
             </Button>
             <Button
               variant="outline"
               size="sm"
               onClick={handleFormat}
               disabled={!script.enabled}
-              title="格式化代码 (Prettier)"
+              title={t("usageScript.format")}
             >
               <Wand2 size={14} />
-              格式化
+              {t("usageScript.format")}
             </Button>
           </div>
 
           {/* Right side - Cancel and Save buttons */}
           <div className="flex gap-2">
             <Button variant="ghost" size="sm" onClick={onClose}>
-              取消
+              {t("common.cancel")}
             </Button>
             <Button variant="default" size="sm" onClick={handleSave}>
-              保存配置
+              {t("usageScript.saveConfig")}
             </Button>
           </div>
         </DialogFooter>
diff --git a/src/components/providers/AddProviderDialog.tsx b/src/components/providers/AddProviderDialog.tsx
index f706350..90252ea 100644
--- a/src/components/providers/AddProviderDialog.tsx
+++ b/src/components/providers/AddProviderDialog.tsx
@@ -135,8 +135,8 @@ export function AddProviderDialog({
 
   const submitLabel =
     appType === "claude"
-      ? t("provider.addClaudeProvider", { defaultValue: "添加 Claude 供应商" })
-      : t("provider.addCodexProvider", { defaultValue: "添加 Codex 供应商" });
+      ? t("provider.addClaudeProvider")
+      : t("provider.addCodexProvider");
 
   return (
     <Dialog open={open} onOpenChange={onOpenChange}>
@@ -144,16 +144,14 @@ export function AddProviderDialog({
         <DialogHeader>
           <DialogTitle>{submitLabel}</DialogTitle>
           <DialogDescription>
-            {t("provider.addDescription", {
-              defaultValue: "填写信息后即可在列表中快速切换供应商。",
-            })}
+            {t("provider.addProviderHint")}
           </DialogDescription>
         </DialogHeader>
 
         <div className="flex-1 overflow-y-auto px-6 py-4">
           <ProviderForm
             appType={appType}
-            submitLabel={t("common.add", { defaultValue: "添加" })}
+            submitLabel={t("common.add")}
             onSubmit={handleSubmit}
             onCancel={() => onOpenChange(false)}
             showButtons={false}
@@ -162,11 +160,11 @@ export function AddProviderDialog({
 
         <DialogFooter>
           <Button variant="outline" onClick={() => onOpenChange(false)}>
-            {t("common.cancel", { defaultValue: "取消" })}
+            {t("common.cancel")}
           </Button>
           <Button type="submit" form="provider-form">
             <Plus className="h-4 w-4" />
-            {t("common.add", { defaultValue: "添加" })}
+            {t("common.add")}
           </Button>
         </DialogFooter>
       </DialogContent>
diff --git a/src/components/providers/EditProviderDialog.tsx b/src/components/providers/EditProviderDialog.tsx
index 316cb70..057bafe 100644
--- a/src/components/providers/EditProviderDialog.tsx
+++ b/src/components/providers/EditProviderDialog.tsx
@@ -66,19 +66,17 @@ export function EditProviderDialog({
       <DialogContent className="max-w-2xl max-h-[90vh] flex flex-col">
         <DialogHeader>
           <DialogTitle>
-            {t("provider.editProvider", { defaultValue: "编辑供应商" })}
+            {t("provider.editProvider")}
           </DialogTitle>
           <DialogDescription>
-            {t("provider.editDescription", {
-              defaultValue: "更新配置后将立即应用到当前供应商。",
-            })}
+            {t("provider.editProviderHint")}
           </DialogDescription>
         </DialogHeader>
 
         <div className="flex-1 overflow-y-auto px-6 py-4">
           <ProviderForm
             appType={appType}
-            submitLabel={t("common.save", { defaultValue: "保存" })}
+            submitLabel={t("common.save")}
             onSubmit={handleSubmit}
             onCancel={() => onOpenChange(false)}
             initialData={{
@@ -92,11 +90,11 @@ export function EditProviderDialog({
 
         <DialogFooter>
           <Button variant="outline" onClick={() => onOpenChange(false)}>
-            {t("common.cancel", { defaultValue: "取消" })}
+            {t("common.cancel")}
           </Button>
           <Button type="submit" form="provider-form">
             <Save className="h-4 w-4" />
-            {t("common.save", { defaultValue: "保存" })}
+            {t("common.save")}
           </Button>
         </DialogFooter>
       </DialogContent>
diff --git a/src/components/providers/ProviderActions.tsx b/src/components/providers/ProviderActions.tsx
index 5552b92..553d57b 100644
--- a/src/components/providers/ProviderActions.tsx
+++ b/src/components/providers/ProviderActions.tsx
@@ -35,25 +35,25 @@ export function ProviderActions({
         {isCurrent ? (
           <>
             <Check className="h-4 w-4" />
-            {t("provider.inUse", { defaultValue: "已启用" })}
+            {t("provider.inUse")}
           </>
         ) : (
           <>
             <Play className="h-4 w-4" />
-            {t("provider.enable", { defaultValue: "启用" })}
+            {t("provider.enable")}
           </>
         )}
       </Button>
 
       <Button size="sm" variant="outline" onClick={onEdit}>
-        {t("common.edit", { defaultValue: "编辑" })}
+        {t("common.edit")}
       </Button>
 
       <Button
         size="sm"
         variant="outline"
         onClick={onConfigureUsage}
-        title={t("provider.configureUsage", { defaultValue: "配置用量查询" })}
+        title={t("provider.configureUsage")}
       >
         <BarChart3 className="h-4 w-4" />
       </Button>
diff --git a/src/components/providers/ProviderCard.tsx b/src/components/providers/ProviderCard.tsx
index 86e99bb..188370c 100644
--- a/src/components/providers/ProviderCard.tsx
+++ b/src/components/providers/ProviderCard.tsx
@@ -104,7 +104,7 @@ export function ProviderCard({
               "mt-1 flex h-8 w-8 items-center justify-center rounded-md border border-transparent text-muted-foreground transition-colors hover:border-muted hover:text-foreground",
               dragHandleProps?.isDragging && "border-primary text-primary",
             )}
-            aria-label={t("provider.dragHandle", { defaultValue: "拖拽排序" })}
+            aria-label={t("provider.dragHandle")}
             {...(dragHandleProps?.attributes ?? {})}
             {...(dragHandleProps?.listeners ?? {})}
           >
@@ -118,7 +118,7 @@ export function ProviderCard({
               </h3>
               {isCurrent && (
                 <span className="rounded-full bg-green-500/10 px-2 py-0.5 text-xs font-medium text-green-500 dark:text-green-400">
-                  {t("provider.currentlyUsing", { defaultValue: "当前使用" })}
+                  {t("provider.currentlyUsing")}
                 </span>
               )}
             </div>
diff --git a/src/components/providers/ProviderEmptyState.tsx b/src/components/providers/ProviderEmptyState.tsx
index dd335b7..cb3b926 100644
--- a/src/components/providers/ProviderEmptyState.tsx
+++ b/src/components/providers/ProviderEmptyState.tsx
@@ -15,16 +15,14 @@ export function ProviderEmptyState({ onCreate }: ProviderEmptyStateProps) {
         <Users className="h-7 w-7 text-muted-foreground" />
       </div>
       <h3 className="text-lg font-semibold">
-        {t("provider.noProviders", { defaultValue: "暂无供应商" })}
+        {t("provider.noProviders")}
       </h3>
       <p className="mt-2 max-w-sm text-sm text-muted-foreground">
-        {t("provider.noProvidersDescription", {
-          defaultValue: "开始添加一个供应商以快速完成切换。",
-        })}
+        {t("provider.noProvidersDescription")}
       </p>
       {onCreate && (
         <Button className="mt-6" onClick={onCreate}>
-          {t("provider.addProvider", { defaultValue: "添加供应商" })}
+          {t("provider.addProvider")}
         </Button>
       )}
     </div>
diff --git a/src/components/providers/forms/BasicFormFields.tsx b/src/components/providers/forms/BasicFormFields.tsx
index 6b0da5c..ae0341f 100644
--- a/src/components/providers/forms/BasicFormFields.tsx
+++ b/src/components/providers/forms/BasicFormFields.tsx
@@ -25,14 +25,12 @@ export function BasicFormFields({ form }: BasicFormFieldsProps) {
         render={({ field }) => (
           <FormItem>
             <FormLabel>
-              {t("provider.name", { defaultValue: "供应商名称" })}
+              {t("provider.name")}
             </FormLabel>
             <FormControl>
               <Input
                 {...field}
-                placeholder={t("provider.namePlaceholder", {
-                  defaultValue: "例如：Claude 官方",
-                })}
+                placeholder={t("provider.namePlaceholder")}
               />
             </FormControl>
             <FormMessage />
@@ -46,7 +44,7 @@ export function BasicFormFields({ form }: BasicFormFieldsProps) {
         render={({ field }) => (
           <FormItem>
             <FormLabel>
-              {t("provider.websiteUrl", { defaultValue: "官网链接" })}
+              {t("provider.websiteUrl")}
             </FormLabel>
             <FormControl>
               <Input {...field} placeholder="https://" />
diff --git a/src/components/providers/forms/ClaudeFormFields.tsx b/src/components/providers/forms/ClaudeFormFields.tsx
index 075a2cb..a4878ec 100644
--- a/src/components/providers/forms/ClaudeFormFields.tsx
+++ b/src/components/providers/forms/ClaudeFormFields.tsx
@@ -137,15 +137,11 @@ export function ClaudeFormFields({
       {shouldShowSpeedTest && (
         <EndpointField
           id="baseUrl"
-          label={t("providerForm.apiEndpoint", { defaultValue: "API 端点" })}
+          label={t("providerForm.apiEndpoint")}
           value={baseUrl}
           onChange={onBaseUrlChange}
-          placeholder={t("providerForm.apiEndpointPlaceholder", {
-            defaultValue: "https://api.example.com",
-          })}
-          hint={t("providerForm.apiHint", {
-            defaultValue: "API 端点地址用于连接服务器",
-          })}
+          placeholder={t("providerForm.apiEndpointPlaceholder")}
+          hint={t("providerForm.apiHint")}
           onManageClick={() => onEndpointModalToggle(true)}
         />
       )}
diff --git a/src/components/providers/forms/CodexFormFields.tsx b/src/components/providers/forms/CodexFormFields.tsx
index 21f2852..5a9bb6c 100644
--- a/src/components/providers/forms/CodexFormFields.tsx
+++ b/src/components/providers/forms/CodexFormFields.tsx
@@ -68,15 +68,11 @@ export function CodexFormFields({
       {shouldShowSpeedTest && (
         <EndpointField
           id="codexBaseUrl"
-          label={t("codexConfig.apiUrlLabel", { defaultValue: "API 端点" })}
+          label={t("codexConfig.apiUrlLabel")}
           value={codexBaseUrl}
           onChange={onBaseUrlChange}
-          placeholder={t("providerForm.codexApiEndpointPlaceholder", {
-            defaultValue: "https://api.example.com/v1",
-          })}
-          hint={t("providerForm.codexApiHint", {
-            defaultValue: "Codex API 端点地址",
-          })}
+          placeholder={t("providerForm.codexApiEndpointPlaceholder")}
+          hint={t("providerForm.codexApiHint")}
           onManageClick={() => onEndpointModalToggle(true)}
         />
       )}
diff --git a/src/components/providers/forms/CommonConfigEditor.tsx b/src/components/providers/forms/CommonConfigEditor.tsx
index b72b70a..ccbdc21 100644
--- a/src/components/providers/forms/CommonConfigEditor.tsx
+++ b/src/components/providers/forms/CommonConfigEditor.tsx
@@ -51,7 +51,7 @@ export function CommonConfigEditor({
       <div className="space-y-2">
         <div className="flex items-center justify-between">
           <Label htmlFor="settingsConfig">
-            {t("provider.configJson", { defaultValue: "配置 JSON" })}
+            {t("provider.configJson")}
           </Label>
           <div className="flex items-center gap-2">
             <label className="inline-flex items-center gap-2 text-sm text-muted-foreground cursor-pointer">
diff --git a/src/components/providers/forms/ProviderForm.tsx b/src/components/providers/forms/ProviderForm.tsx
index b5a6f4c..ed6ad6d 100644
--- a/src/components/providers/forms/ProviderForm.tsx
+++ b/src/components/providers/forms/ProviderForm.tsx
@@ -554,7 +554,7 @@ export function ProviderForm({
         {showButtons && (
           <div className="flex justify-end gap-2">
             <Button variant="outline" type="button" onClick={onCancel}>
-              {t("common.cancel", { defaultValue: "取消" })}
+              {t("common.cancel")}
             </Button>
             <Button type="submit">{submitLabel}</Button>
           </div>
diff --git a/src/components/providers/forms/ProviderPresetSelector.tsx b/src/components/providers/forms/ProviderPresetSelector.tsx
index d373370..4f0ca65 100644
--- a/src/components/providers/forms/ProviderPresetSelector.tsx
+++ b/src/components/providers/forms/ProviderPresetSelector.tsx
@@ -28,7 +28,7 @@ export function ProviderPresetSelector({
   return (
     <div className="space-y-3">
       <FormLabel>
-        {t("providerPreset.label", { defaultValue: "预设供应商" })}
+        {t("providerPreset.label")}
       </FormLabel>
       <div className="flex flex-wrap gap-2">
         {/* 自定义按钮 */}
@@ -41,7 +41,7 @@ export function ProviderPresetSelector({
               : "bg-gray-100 dark:bg-gray-800 text-gray-500 dark:text-gray-400 hover:bg-gray-200 dark:hover:bg-gray-700"
           }`}
         >
-          {t("providerPreset.custom", { defaultValue: "自定义配置" })}
+          {t("providerPreset.custom")}
         </button>
 
         {/* 预设按钮 */}
diff --git a/src/i18n/locales/en.json b/src/i18n/locales/en.json
index 739df61..f5a7d69 100644
--- a/src/i18n/locales/en.json
+++ b/src/i18n/locales/en.json
@@ -73,13 +73,15 @@
     "sortUpdateFailed": "Failed to update sort order",
     "configureUsage": "Configure usage query",
     "name": "Provider Name",
+    "namePlaceholder": "e.g., Claude Official",
     "websiteUrl": "Website URL",
     "configJson": "Config JSON",
     "writeCommonConfig": "Write common config",
     "editCommonConfigButton": "Edit common config",
     "configJsonHint": "Please fill in complete Claude Code configuration",
     "editCommonConfigTitle": "Edit common config snippet",
-    "editCommonConfigHint": "Common config snippet will be merged into all providers that enable it"
+    "editCommonConfigHint": "Common config snippet will be merged into all providers that enable it",
+    "addProvider": "Add Provider"
   },
   "notifications": {
     "providerSaved": "Provider configuration saved",
@@ -297,6 +299,48 @@
     "other": "Other",
     "hint": "You can continue to adjust the fields below after selecting a preset."
   },
+  "usage": {
+    "queryFailed": "Query failed",
+    "refreshUsage": "Refresh usage",
+    "planUsage": "Plan usage",
+    "invalid": "Expired",
+    "total": "Total:",
+    "used": "Used:",
+    "remaining": "Remaining:"
+  },
+  "usageScript": {
+    "title": "Configure Usage Query",
+    "enableUsageQuery": "Enable usage query",
+    "presetTemplate": "Preset template",
+    "queryScript": "Query script (JavaScript)",
+    "timeoutSeconds": "Timeout (seconds)",
+    "scriptHelp": "Script writing instructions:",
+    "configFormat": "Configuration format:",
+    "extractorFormat": "Extractor return format (all fields optional):",
+    "tips": "💡 Tips:",
+    "testing": "Testing...",
+    "testScript": "Test script",
+    "format": "Format",
+    "saveConfig": "Save config",
+    "scriptEmpty": "Script configuration cannot be empty",
+    "mustHaveReturn": "Script must contain return statement",
+    "testSuccess": "Test successful!",
+    "testFailed": "Test failed",
+    "formatSuccess": "Format successful",
+    "formatFailed": "Format failed",
+    "variablesHint": "Supported variables: {{apiKey}}, {{baseUrl}} | extractor function receives API response JSON object",
+    "fieldIsValid": "• isValid: Boolean, whether plan is valid",
+    "fieldInvalidMessage": "• invalidMessage: String, reason for expiration (shown when isValid is false)",
+    "fieldRemaining": "• remaining: Number, remaining quota",
+    "fieldUnit": "• unit: String, unit (e.g., \"USD\")",
+    "fieldPlanName": "• planName: String, plan name",
+    "fieldTotal": "• total: Number, total quota",
+    "fieldUsed": "• used: Number, used quota",
+    "fieldExtra": "• extra: String, custom display text",
+    "tip1": "• Variables {{apiKey}} and {{baseUrl}} are automatically replaced",
+    "tip2": "• Extractor function runs in sandbox environment, supports ES2020+ syntax",
+    "tip3": "• Entire config must be wrapped in () to form object literal expression"
+  },
   "kimiSelector": {
     "modelConfig": "Model Configuration",
     "mainModel": "Main Model",
diff --git a/src/i18n/locales/zh.json b/src/i18n/locales/zh.json
index 09a6632..5857112 100644
--- a/src/i18n/locales/zh.json
+++ b/src/i18n/locales/zh.json
@@ -73,13 +73,15 @@
     "sortUpdateFailed": "排序更新失败",
     "configureUsage": "配置用量查询",
     "name": "供应商名称",
+    "namePlaceholder": "例如：Claude 官方",
     "websiteUrl": "官网链接",
     "configJson": "配置 JSON",
     "writeCommonConfig": "写入通用配置",
     "editCommonConfigButton": "编辑通用配置",
     "configJsonHint": "请填写完整的 Claude Code 配置",
     "editCommonConfigTitle": "编辑通用配置片段",
-    "editCommonConfigHint": "通用配置片段将合并到所有启用它的供应商配置中"
+    "editCommonConfigHint": "通用配置片段将合并到所有启用它的供应商配置中",
+    "addProvider": "添加供应商"
   },
   "notifications": {
     "providerSaved": "供应商配置已保存",
@@ -297,6 +299,48 @@
     "other": "其他",
     "hint": "选择预设后可继续调整下方字段。"
   },
+  "usage": {
+    "queryFailed": "查询失败",
+    "refreshUsage": "刷新用量",
+    "planUsage": "套餐用量",
+    "invalid": "已失效",
+    "total": "总：",
+    "used": "使用：",
+    "remaining": "剩余："
+  },
+  "usageScript": {
+    "title": "配置用量查询",
+    "enableUsageQuery": "启用用量查询",
+    "presetTemplate": "预设模板",
+    "queryScript": "查询脚本（JavaScript）",
+    "timeoutSeconds": "超时时间（秒）",
+    "scriptHelp": "脚本编写说明：",
+    "configFormat": "配置格式：",
+    "extractorFormat": "extractor 返回格式（所有字段均为可选）：",
+    "tips": "💡 提示：",
+    "testing": "测试中...",
+    "testScript": "测试脚本",
+    "format": "格式化",
+    "saveConfig": "保存配置",
+    "scriptEmpty": "脚本配置不能为空",
+    "mustHaveReturn": "脚本必须包含 return 语句",
+    "testSuccess": "测试成功！",
+    "testFailed": "测试失败",
+    "formatSuccess": "格式化成功",
+    "formatFailed": "格式化失败",
+    "variablesHint": "支持变量: {{apiKey}}, {{baseUrl}} | extractor 函数接收 API 响应的 JSON 对象",
+    "fieldIsValid": "• isValid: 布尔值，套餐是否有效",
+    "fieldInvalidMessage": "• invalidMessage: 字符串，失效原因说明（当 isValid 为 false 时显示）",
+    "fieldRemaining": "• remaining: 数字，剩余额度",
+    "fieldUnit": "• unit: 字符串，单位（如 \"USD\"）",
+    "fieldPlanName": "• planName: 字符串，套餐名称",
+    "fieldTotal": "• total: 数字，总额度",
+    "fieldUsed": "• used: 数字，已用额度",
+    "fieldExtra": "• extra: 字符串，扩展字段，可自由补充需要展示的文本",
+    "tip1": "• 变量 {{apiKey}} 和 {{baseUrl}} 会自动替换",
+    "tip2": "• extractor 函数在沙箱环境中执行，支持 ES2020+ 语法",
+    "tip3": "• 整个配置必须用 () 包裹，形成对象字面量表达式"
+  },
   "kimiSelector": {
     "modelConfig": "模型配置",
     "mainModel": "主模型",