feat: implement i18n

frontend/src/core/i18n/locales/en-US.ts

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+import type { Translations } from "./types";
+
+export const enUS: Translations = {
+  // Common
+  common: {
+    home: "Home",
+    settings: "Settings",
+    delete: "Delete",
+    openInNewWindow: "Open in new window",
+    close: "Close",
+    more: "More",
+    search: "Search",
+    download: "Download",
+    thinking: "Thinking",
+    artifacts: "Artifacts",
+  },
+
+  // Welcome
+  welcome: {
+    greeting: "👋 Hello, again!",
+    description:
+      "Welcome to 🦌 DeerFlow, an open source super agent. With built-in and custom skills, DeerFlow helps you search on the web, analyze data, and generate artifacts like slides, web pages and do almost anything.",
+  },
+
+  // Clipboard
+  clipboard: {
+    copyToClipboard: "Copy to clipboard",
+    copiedToClipboard: "Copied to clipboard",
+    failedToCopyToClipboard: "Failed to copy to clipboard",
+  },
+
+  // Input Box
+  inputBox: {
+    placeholder: "How can I assist you today?",
+    thinkingEnabled: "Thinking is enabled",
+    thinkingDisabled: "Thinking is disabled",
+    clickToDisableThinking: "Click to disable thinking",
+    clickToEnableThinking: "Click to enable thinking",
+    searchModels: "Search models...",
+  },
+
+  // Sidebar
+  sidebar: {
+    newChat: "New chat",
+    chats: "Chats",
+    recentChats: "Recent chats",
+  },
+
+  // Breadcrumb
+  breadcrumb: {
+    workspace: "Workspace",
+    chats: "Chats",
+  },
+
+  // Workspace
+  workspace: {
+    githubTooltip: "DeerFlow on Github",
+  },
+
+  // Conversation
+  conversation: {
+    noMessages: "No messages yet",
+    startConversation: "Start a conversation to see messages here",
+  },
+
+  // Chats
+  chats: {
+    searchChats: "Search chats",
+  },
+
+  // Tool calls
+  toolCalls: {
+    moreSteps: (count: number) => `${count} more step${count === 1 ? "" : "s"}`,
+    lessSteps: "Less steps",
+    executeCommand: "Execute command",
+    presentFiles: "Present files",
+    needYourHelp: "Need your help",
+    useTool: (toolName: string) => `Use "${toolName}" tool`,
+    searchForRelatedInfo: "Search for related information",
+    searchOnWebFor: (query: string) => `Search on the web for "${query}"`,
+    viewWebPage: "View web page",
+    listFolder: "List folder",
+    readFile: "Read file",
+    writeFile: "Write file",
+  },
+};

frontend/src/core/i18n/locales/index.ts

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+export { enUS } from "./en-US";
+export { zhCN } from "./zh-CN";
+export type { Translations } from "./types";

frontend/src/core/i18n/locales/types.ts

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+export interface Translations {
+  // Common
+  common: {
+    home: string;
+    settings: string;
+    delete: string;
+    openInNewWindow: string;
+    close: string;
+    more: string;
+    search: string;
+    download: string;
+    thinking: string;
+    artifacts: string;
+  };
+
+  // Welcome
+  welcome: {
+    greeting: string;
+    description: string;
+  };
+
+  // Clipboard
+  clipboard: {
+    copyToClipboard: string;
+    copiedToClipboard: string;
+    failedToCopyToClipboard: string;
+  };
+
+  // Input Box
+  inputBox: {
+    placeholder: string;
+    thinkingEnabled: string;
+    thinkingDisabled: string;
+    clickToDisableThinking: string;
+    clickToEnableThinking: string;
+    searchModels: string;
+  };
+
+  // Sidebar
+  sidebar: {
+    recentChats: string;
+    newChat: string;
+    chats: string;
+  };
+
+  // Breadcrumb
+  breadcrumb: {
+    workspace: string;
+    chats: string;
+  };
+
+  // Workspace
+  workspace: {
+    githubTooltip: string;
+  };
+
+  // Conversation
+  conversation: {
+    noMessages: string;
+    startConversation: string;
+  };
+
+  // Chats
+  chats: {
+    searchChats: string;
+  };
+
+  // Tool calls
+  toolCalls: {
+    moreSteps: (count: number) => string;
+    lessSteps: string;
+    executeCommand: string;
+    presentFiles: string;
+    needYourHelp: string;
+    useTool: (toolName: string) => string;
+    searchForRelatedInfo: string;
+    searchOnWebFor: (query: string) => string;
+    viewWebPage: string;
+    listFolder: string;
+    readFile: string;
+    writeFile: string;
+  };
+}

frontend/src/core/i18n/locales/zh-CN.ts

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+import type { Translations } from "./types";
+
+export const zhCN: Translations = {
+  // Common
+  common: {
+    home: "首页",
+    settings: "设置",
+    delete: "删除",
+    openInNewWindow: "在新窗口打开",
+    close: "关闭",
+    more: "更多",
+    search: "搜索",
+    download: "下载",
+    thinking: "思考",
+    artifacts: "文件",
+  },
+
+  // Welcome
+  welcome: {
+    greeting: "👋 你好，欢迎回来！",
+    description:
+      "欢迎使用 🦌 DeerFlow，一个完全开源的超级智能体。通过内置和\n自定义的 Skills，DeerFlow 可以帮你搜索网络、分析数据，\n还能为你生成幻灯片、网页等作品，几乎可以做任何事情。",
+  },
+
+  // Clipboard
+  clipboard: {
+    copyToClipboard: "复制到剪贴板",
+    copiedToClipboard: "已复制到剪贴板",
+    failedToCopyToClipboard: "复制到剪贴板失败",
+  },
+
+  // Input Box
+  inputBox: {
+    placeholder: "今天我能为你做些什么？",
+    thinkingEnabled: "思考功能已启用",
+    thinkingDisabled: "思考功能已禁用",
+    clickToDisableThinking: "点击禁用思考功能",
+    clickToEnableThinking: "点击启用思考功能",
+    searchModels: "搜索模型...",
+  },
+
+  // Sidebar
+  sidebar: {
+    newChat: "新对话",
+    chats: "对话",
+    recentChats: "最近的聊天",
+  },
+
+  // Breadcrumb
+  breadcrumb: {
+    workspace: "工作区",
+    chats: "对话",
+  },
+
+  // Workspace
+  workspace: {
+    githubTooltip: "DeerFlow 在 Github",
+  },
+
+  // Conversation
+  conversation: {
+    noMessages: "还没有消息",
+    startConversation: "开始新的对话以查看消息",
+  },
+
+  // Chats
+  chats: {
+    searchChats: "搜索对话",
+  },
+
+  // Tool calls
+  toolCalls: {
+    moreSteps: (count: number) => `查看其他 ${count} 个步骤`,
+    lessSteps: "隐藏步骤",
+    executeCommand: "执行命令",
+    presentFiles: "展示文件",
+    needYourHelp: "需要你的协助",
+    useTool: (toolName: string) => `使用 “${toolName}” 工具`,
+    searchForRelatedInfo: "搜索相关信息",
+    searchOnWebFor: (query: string) => `在网络上搜索 “${query}”`,
+    viewWebPage: "查看网页",
+    listFolder: "列出文件夹",
+    readFile: "读取文件",
+    writeFile: "写入文件",
+  },
+};