feat: add backend i18n response support

app/api/endpoints/agent.py

@@ -34,6 +34,7 @@ from app.db.models.agentchat import AgentChat
 from app.db.user_oper import UserOper, get_current_active_user
 from app.helper.agent import attach_web_agent_edit_queue, detach_web_agent_edit_queue
 from app.helper.interaction import agent_interaction_manager, media_interaction_manager
+from app.helper.locale import LocaleHelper
 from app.log import logger
 from app.schemas.types import EventType, MessageChannel
 
@@ -326,15 +327,25 @@ def _save_web_agent_display_snapshot(
         logger.debug(f"保存WebAgent展示历史失败: {e}")
 
 
-def _build_web_agent_sse(event_type: str, data: Optional[dict] = None) -> str:
+def _build_web_agent_sse(
+        event_type: str,
+        data: Optional[dict] = None,
+        locale: Optional[str] = None,
+) -> str:
     """
     构建 Web Agent SSE 消息。
 
     :param event_type: 前端事件类型
     :param data: 事件数据
+    :param locale: 当前请求语言
     :return: 符合 SSE 格式的字符串
     """
     payload = {"type": event_type, **(data or {})}
+    message = payload.get("message")
+    if event_type == "error" and isinstance(message, str):
+        payload["message_i18n"] = LocaleHelper.translate_text(
+            message, locale=locale
+        )
     return f"data: {json.dumps(payload, ensure_ascii=False)}\n\n"
 
 
@@ -1597,6 +1608,7 @@ async def web_agent_stream(
     :return: SSE 流式响应
     """
     prompt = payload.text.strip()
+    locale = LocaleHelper.get_locale_from_request(request)
     display_prompt = (payload.display_text or payload.text).strip()
     is_traditional_message = (
         _is_web_agent_traditional_message(prompt)
@@ -1610,6 +1622,7 @@ async def web_agent_stream(
                     _build_web_agent_sse(
                         "error",
                         {"message": denied_message},
+                        locale=locale,
                     )
                 ]),
                 media_type="text/event-stream",
@@ -1621,6 +1634,7 @@ async def web_agent_stream(
                     _build_web_agent_sse(
                         "error",
                         {"message": unknown_command_message},
+                        locale=locale,
                     )
                 ]),
                 media_type="text/event-stream",
@@ -1649,7 +1663,11 @@ async def web_agent_stream(
             """
             生成传统消息链路的 WebAgent SSE 事件。
             """
-            yield _build_web_agent_sse("start", {"session_id": session_id})
+            yield _build_web_agent_sse(
+                "start",
+                {"session_id": session_id},
+                locale=locale,
+            )
             events = await _collect_web_agent_traditional_events(
                 text=prompt,
                 current_user=current_user,
@@ -1660,7 +1678,11 @@ async def web_agent_stream(
             display_messages.append(assistant_message)
             for event in events:
                 event_payload = copy.deepcopy(event)
-                yield _build_web_agent_sse(event_payload.pop("type"), event_payload)
+                yield _build_web_agent_sse(
+                    event_payload.pop("type"),
+                    event_payload,
+                    locale=locale,
+                )
                 if await request.is_disconnected():
                     break
             await run_in_threadpool(
@@ -1670,7 +1692,7 @@ async def web_agent_stream(
                 messages=display_messages,
                 client_session_id=payload.session_id or session_id,
             )
-            yield _build_web_agent_sse("done", {})
+            yield _build_web_agent_sse("done", {}, locale=locale)
 
         return StreamingResponse(
             traditional_event_generator(),
@@ -1688,6 +1710,7 @@ async def web_agent_stream(
                 _build_web_agent_sse(
                     "error",
                     {"message": "智能助手未启用，请先在系统设置中开启。"},
+                    locale=locale,
                 )
             ]),
             media_type="text/event-stream",
@@ -1703,6 +1726,7 @@ async def web_agent_stream(
                 _build_web_agent_sse(
                     "error",
                     {"message": "语音识别失败，请稍后重试。"},
+                    locale=locale,
                 )
             ]),
             media_type="text/event-stream",
@@ -1713,6 +1737,7 @@ async def web_agent_stream(
                 _build_web_agent_sse(
                     "error",
                     {"message": "请输入要发送给智能助手的内容或选择附件。"},
+                    locale=locale,
                 )
             ]),
             media_type="text/event-stream",
@@ -1825,6 +1850,7 @@ async def web_agent_stream(
             yield _build_web_agent_sse(
                 "start",
                 {"session_id": session_id},
+                locale=locale,
             )
             disconnected = False
             while not global_vars.is_system_stopped:
@@ -1832,7 +1858,11 @@ async def web_agent_stream(
                     disconnected = True
                     break
                 event = await event_queue.get()
-                yield _build_web_agent_sse(event.pop("type"), event)
+                yield _build_web_agent_sse(
+                    event.pop("type"),
+                    event,
+                    locale=locale,
+                )
                 if task.done() and event_queue.empty():
                     break
         except asyncio.CancelledError:

app/api/endpoints/search.py

@@ -12,6 +12,7 @@ from app.core.config import settings
 from app.core.event import eventmanager
 from app.core.metainfo import MetaInfo
 from app.core.security import verify_resource_token, verify_token
+from app.helper.locale import LocaleHelper
 from app.log import logger
 from app.schemas import MediaRecognizeConvertEventData
 from app.schemas.types import MediaType, ChainEventType
@@ -39,11 +40,22 @@ def _parse_media_type(mtype: Optional[str]) -> Optional[MediaType]:
     return MediaType.from_agent(mtype) or MediaType(mtype)
 
 
-def _sse_event(data: dict) -> str:
+def _sse_event(data: dict, locale: Optional[str] = None) -> str:
     """
     转换为SSE事件
     """
-    return f"data: {json.dumps(data, ensure_ascii=False)}\n\n"
+    payload = data
+    message = payload.get("message")
+    text = payload.get("text")
+    if isinstance(message, str) or isinstance(text, str):
+        payload = data.copy()
+        if isinstance(message, str):
+            payload["message_i18n"] = LocaleHelper.translate_text(
+                message, locale=locale
+            )
+        if isinstance(text, str):
+            payload["text_i18n"] = LocaleHelper.translate_text(text, locale=locale)
+    return f"data: {json.dumps(payload, ensure_ascii=False)}\n\n"
 
 
 def _serialize_signed_subtitle_result(subtitle: Any) -> dict:
@@ -167,6 +179,7 @@ async def _stream_search_events(request: Request, event_source: AsyncIterator[di
     """
     输出搜索SSE事件
     """
+    locale = LocaleHelper.get_locale_from_request(request)
     try:
         has_sent_final_replace = False
         async for event in _iter_batched_search_events(event_source):
@@ -182,10 +195,13 @@ async def _stream_search_events(request: Request, event_source: AsyncIterator[di
                 and event.get("items")
             ):
                 event = {key: value for key, value in event.items() if key != "items"}
-            yield _sse_event(event)
+            yield _sse_event(event, locale=locale)
     except Exception as err:
         logger.error(f"渐进式搜索出错：{err}", exc_info=True)
-        yield _sse_event({"type": "error", "success": False, "message": str(err)})
+        yield _sse_event(
+            {"type": "error", "success": False, "message": str(err)},
+            locale=locale,
+        )
 
 
 @router.get("/last", summary="查询搜索结果", response_model=List[schemas.Context])

app/api/endpoints/system.py

@@ -35,10 +35,11 @@ from app.db.user_oper import (
     get_current_active_user_async,
 )
 from app.helper.image import ImageHelper
+from app.helper.locale import LocaleHelper
 from app.helper.message import MessageHelper
-from app.helper.server import MoviePilotServerHelper
 from app.helper.progress import ProgressHelper
 from app.helper.rule import RuleHelper
+from app.helper.server import MoviePilotServerHelper
 from app.helper.system import SystemHelper
 from app.log import logger
 from app.scheduler import Scheduler
@@ -797,13 +798,14 @@ async def get_progress(
     实时获取处理进度，返回格式为SSE
     """
     progress = ProgressHelper(process_type)
+    locale = LocaleHelper.get_current_locale()
 
     async def event_generator():
         try:
             while not global_vars.is_system_stopped:
                 if await request.is_disconnected():
                     break
-                detail = progress.get()
+                detail = progress.get(locale=locale)
                 yield f"data: {json.dumps(detail)}\n\n"
                 await asyncio.sleep(0.5)
         except asyncio.CancelledError:
@@ -1271,13 +1273,20 @@ def modulelist(_: schemas.TokenPayload = Depends(verify_token)):
     """
     查询已加载的模块ID列表
     """
-    modules = [
+    modules = []
-        {
+    for module_id, module in ModuleManager().get_modules().items():
-            "id": k,
+        name = module.get_name()
-            "name": v.get_name(),
+        modules.append(
-        }
+            {
-        for k, v in ModuleManager().get_modules().items()
+                "id": module_id,
-    ]
+                "name": name,
+                "name_i18n": LocaleHelper.translate(
+                    f"system.modules.{module_id}.name",
+                    default=name,
+                ),
+                "name_key": f"system.modules.{module_id}.name",
+            }
+        )
     return schemas.Response(success=True, data={"modules": modules})
 
 

app/factory.py

@@ -1,10 +1,35 @@
-from fastapi import FastAPI
+from typing import Awaitable, Callable
+
+from fastapi import FastAPI, HTTPException, Request, Response
 from fastapi.middleware.cors import CORSMiddleware
+from fastapi.responses import JSONResponse
 
 from app.core.config import settings
+from app.helper.locale import LocaleHelper
 from app.startup.lifecycle import lifespan
 
 
+async def localized_http_exception_handler(
+        _request: Request,
+        exc: HTTPException,
+) -> JSONResponse:
+    """
+    为 HTTPException 响应补充多语言错误详情。
+
+    :param _request: 当前 HTTP 请求
+    :param exc: FastAPI HTTP 异常
+    :return: 带 detail_i18n 的 JSON 错误响应
+    """
+    content = {"detail": exc.detail}
+    if isinstance(exc.detail, str):
+        content["detail_i18n"] = LocaleHelper.translate_text(exc.detail)
+    return JSONResponse(
+        status_code=exc.status_code,
+        content=content,
+        headers=exc.headers,
+    )
+
+
 def create_app() -> FastAPI:
     """
     创建并配置 FastAPI 应用实例。
@@ -15,6 +40,8 @@ def create_app() -> FastAPI:
         lifespan=lifespan
     )
 
+    _app.add_exception_handler(HTTPException, localized_http_exception_handler)
+
     # 配置 CORS 中间件
     _app.add_middleware(
         CORSMiddleware,  # noqa
@@ -24,6 +51,22 @@ def create_app() -> FastAPI:
         allow_headers=["*"],
     )
 
+    @_app.middleware("http")
+    async def locale_context_middleware(
+            request: Request,
+            call_next: Callable[[Request], Awaitable[Response]],
+    ) -> Response:
+        """
+        为每个请求设置后端多语言上下文。
+        """
+        token = LocaleHelper.set_current_locale(
+            LocaleHelper.get_locale_from_request(request)
+        )
+        try:
+            return await call_next(request)
+        finally:
+            LocaleHelper.reset_current_locale(token)
+
     return _app
 
 

app/helper/locale.py

@@ -0,0 +1,280 @@
+import json
+import re
+from contextvars import ContextVar, Token
+from functools import lru_cache
+from pathlib import Path
+from typing import Any, Optional
+
+
+class LocaleHelper:
+    """
+    后端多语言文本辅助器。
+
+    该类只为需要返回给前端展示的文本生成并行多语言字段，旧有中文字段仍由调用方保留。
+    """
+
+    DEFAULT_LOCALE = "zh-CN"
+    SUPPORTED_LOCALES = ("zh-CN", "zh-TW", "en-US")
+    HEADER_NAMES = ("x-moviepilot-locale", "x-locale")
+    _PATTERN_FIELD = re.compile(r"\{([A-Za-z_][A-Za-z0-9_]*)\}")
+    _CURRENT_LOCALE: ContextVar[str] = ContextVar("moviepilot_locale", default=DEFAULT_LOCALE)
+    _LOCALES_DIR = Path(__file__).resolve().parents[1] / "locales"
+    _LOCALE_ALIASES = {
+        "zh": "zh-CN",
+        "zh-cn": "zh-CN",
+        "zh-hans": "zh-CN",
+        "zh-hans-cn": "zh-CN",
+        "zh-tw": "zh-TW",
+        "zh-hant": "zh-TW",
+        "zh-hant-tw": "zh-TW",
+        "en": "en-US",
+        "en-us": "en-US",
+    }
+
+    @classmethod
+    def normalize_locale(cls, locale: Optional[str]) -> str:
+        """
+        规范化语言标识，无法识别时返回默认简体中文。
+
+        :param locale: 原始语言标识，如 zh-CN、zh_CN、en-US
+        :return: 项目支持的语言标识
+        """
+        return cls._match_locale(locale) or cls.DEFAULT_LOCALE
+
+    @classmethod
+    def get_locale_from_request(cls, request: Any) -> str:
+        """
+        从请求参数或请求头解析前端期望语言。
+
+        :param request: FastAPI Request 或带 headers 属性的兼容对象
+        :return: 项目支持的语言标识
+        """
+        query_params = getattr(request, "query_params", {}) or {}
+        query_locale = query_params.get("locale") if hasattr(query_params, "get") else None
+        if query_locale:
+            return cls.normalize_locale(query_locale)
+
+        headers = getattr(request, "headers", {}) or {}
+        for header_name in cls.HEADER_NAMES:
+            value = headers.get(header_name)
+            if value:
+                return cls.normalize_locale(value)
+
+        accept_language = headers.get("accept-language")
+        if not accept_language:
+            return cls.DEFAULT_LOCALE
+
+        choices = []
+        for index, item in enumerate(accept_language.split(",")):
+            parts = [part.strip() for part in item.split(";") if part.strip()]
+            if not parts:
+                continue
+            quality = 1.0
+            for part in parts[1:]:
+                if part.startswith("q="):
+                    try:
+                        quality = float(part[2:])
+                    except ValueError:
+                        quality = 0.0
+            choices.append((-quality, index, parts[0]))
+
+        for _, _, candidate in sorted(choices):
+            locale = cls._match_locale(candidate)
+            if locale:
+                return locale
+        return cls.DEFAULT_LOCALE
+
+    @classmethod
+    def get_current_locale(cls) -> str:
+        """
+        获取当前请求上下文中的语言标识。
+
+        :return: 项目支持的语言标识
+        """
+        return cls._CURRENT_LOCALE.get()
+
+    @classmethod
+    def set_current_locale(cls, locale: Optional[str]) -> Token[str]:
+        """
+        设置当前请求上下文中的语言标识。
+
+        :param locale: 原始语言标识
+        :return: 用于恢复上下文的令牌
+        """
+        return cls._CURRENT_LOCALE.set(cls.normalize_locale(locale))
+
+    @classmethod
+    def reset_current_locale(cls, token: Token[str]) -> None:
+        """
+        恢复当前请求上下文中的语言标识。
+
+        :param token: set_current_locale 返回的上下文令牌
+        """
+        cls._CURRENT_LOCALE.reset(token)
+
+    @classmethod
+    def translate(
+            cls,
+            key: str,
+            locale: Optional[str] = None,
+            default: Optional[str] = None,
+            **kwargs: Any,
+    ) -> str:
+        """
+        根据翻译键获取多语言文本。
+
+        :param key: 点分隔翻译键
+        :param locale: 目标语言，未传入或无法识别时使用默认语言
+        :param default: 翻译缺失时返回的默认文本
+        :param kwargs: 字符串格式化参数
+        :return: 翻译后的文本
+        """
+        normalized_locale = cls.normalize_locale(locale) if locale else cls.get_current_locale()
+        template = cls._lookup(cls._load_catalog(normalized_locale), key)
+        if template is None and normalized_locale != cls.DEFAULT_LOCALE:
+            template = cls._lookup(cls._load_catalog(cls.DEFAULT_LOCALE), key)
+        if template is None:
+            template = default or key
+        return cls._format(template, kwargs)
+
+    @classmethod
+    def translate_text(cls, text: Optional[str], locale: Optional[str] = None) -> str:
+        """
+        翻译存量接口返回的中文文本。
+
+        :param text: 原始中文文本
+        :param locale: 目标语言，未传入或无法识别时使用默认语言
+        :return: 翻译后的文本，缺失翻译时返回原文
+        """
+        if not text:
+            return ""
+        normalized_locale = cls.normalize_locale(locale) if locale else cls.get_current_locale()
+        translated = cls._lookup_message(cls._load_catalog(normalized_locale), text)
+        if translated is None and cls._contains_chinese(text):
+            translated = cls._lookup_pattern(normalized_locale, text)
+        if translated is None and normalized_locale != cls.DEFAULT_LOCALE:
+            translated = cls._lookup_message(cls._load_catalog(cls.DEFAULT_LOCALE), text)
+        if (
+                translated is None
+                and normalized_locale != cls.DEFAULT_LOCALE
+                and cls._contains_chinese(text)
+        ):
+            translated = cls._lookup_pattern(cls.DEFAULT_LOCALE, text)
+        return translated or text
+
+    @classmethod
+    def _match_locale(cls, locale: Optional[str]) -> Optional[str]:
+        """
+        将原始语言标识匹配为项目支持的语言。
+        """
+        if not locale:
+            return None
+        normalized = locale.strip().replace("_", "-").lower()
+        if not normalized:
+            return None
+        return cls._LOCALE_ALIASES.get(normalized)
+
+    @staticmethod
+    @lru_cache(maxsize=16)
+    def _load_catalog(locale: str) -> dict[str, Any]:
+        """
+        加载指定语言的翻译表。
+        """
+        catalog_path = LocaleHelper._LOCALES_DIR / f"{locale}.json"
+        try:
+            with catalog_path.open("r", encoding="utf-8") as file:
+                return json.load(file)
+        except (FileNotFoundError, json.JSONDecodeError):
+            return {}
+
+    @staticmethod
+    def _lookup(catalog: dict[str, Any], key: str) -> Optional[str]:
+        """
+        按点分隔键从结构化翻译表中查找文本。
+        """
+        current: Any = catalog
+        for part in key.split("."):
+            if not isinstance(current, dict) or part not in current:
+                return None
+            current = current[part]
+        return current if isinstance(current, str) else None
+
+    @staticmethod
+    def _lookup_message(catalog: dict[str, Any], text: str) -> Optional[str]:
+        """
+        从精确消息表中查找存量中文文本。
+        """
+        messages = catalog.get("messages")
+        if not isinstance(messages, dict):
+            return None
+        translated = messages.get(text)
+        return translated if isinstance(translated, str) else None
+
+    @classmethod
+    def _lookup_pattern(cls, locale: str, text: str) -> Optional[str]:
+        """
+        使用动态模板匹配存量中文文本。
+        """
+        for pattern, target in cls._load_pattern_matchers(locale):
+            matched = pattern.fullmatch(text)
+            if matched:
+                return cls._format(target, matched.groupdict())
+        return None
+
+    @staticmethod
+    @lru_cache(maxsize=16)
+    def _load_pattern_matchers(locale: str) -> list[tuple[re.Pattern[str], str]]:
+        """
+        加载并缓存指定语言的动态文本匹配器。
+        """
+        catalog = LocaleHelper._load_catalog(locale)
+        patterns = catalog.get("message_patterns")
+        if not isinstance(patterns, list):
+            return []
+        matchers = []
+        for item in patterns:
+            if not isinstance(item, dict):
+                continue
+            source = item.get("source")
+            target = item.get("target")
+            if not isinstance(source, str) or not isinstance(target, str):
+                continue
+            pattern = LocaleHelper._compile_pattern(source)
+            if pattern is None:
+                continue
+            matchers.append((pattern, target))
+        return matchers
+
+    @classmethod
+    def _compile_pattern(cls, source: str) -> Optional[re.Pattern[str]]:
+        """
+        将带命名占位符的中文模板编译为正则。
+        """
+        field_names = cls._PATTERN_FIELD.findall(source)
+        if not field_names:
+            return None
+
+        pattern = cls._PATTERN_FIELD.sub(
+            lambda match: f"(?P<{match.group(1)}>.+?)",
+            re.escape(source).replace(r"\{", "{").replace(r"\}", "}"),
+        )
+        return re.compile(pattern)
+
+    @staticmethod
+    def _contains_chinese(text: str) -> bool:
+        """
+        判断文本是否包含中文字符。
+        """
+        return any("\u4e00" <= char <= "\u9fff" for char in text)
+
+    @staticmethod
+    def _format(template: str, kwargs: dict[str, Any]) -> str:
+        """
+        格式化翻译模板，参数缺失时保留模板原文。
+        """
+        if not kwargs:
+            return template
+        try:
+            return template.format(**kwargs)
+        except (KeyError, AttributeError, IndexError):
+            return template

app/helper/progress.py

@@ -1,7 +1,8 @@
 from enum import Enum
-from typing import Union, Optional
+from typing import Optional, Union
 
 from app.core.cache import TTLCache
+from app.helper.locale import LocaleHelper
 from app.schemas.types import ProgressKey
 
 
@@ -82,8 +83,34 @@ class ProgressHelper:
             current['data'].update(data)
         self._progress[self._key] = current
 
-    def get(self) -> Optional[dict]:
+    def get(self, locale: Optional[str] = None) -> Optional[dict]:
         """
-        获取当前进度
+        获取当前进度，并按语言补充前端展示字段。
+
+        :param locale: 目标语言，未传入时使用当前请求上下文语言
+        :return: 当前进度字典
         """
-        return self._progress.get(self._key)
+        current = self._progress.get(self._key)
+        if not current:
+            return current
+
+        detail = current.copy()
+        text = detail.get("text")
+        if isinstance(text, str):
+            detail["text_i18n"] = LocaleHelper.translate_text(text, locale=locale)
+
+        data = detail.get("data")
+        if isinstance(data, dict):
+            localized_data = data.copy()
+            error = localized_data.get("error")
+            message = localized_data.get("message")
+            if isinstance(error, str):
+                localized_data["error_i18n"] = LocaleHelper.translate_text(
+                    error, locale=locale
+                )
+            if isinstance(message, str):
+                localized_data["message_i18n"] = LocaleHelper.translate_text(
+                    message, locale=locale
+                )
+            detail["data"] = localized_data
+        return detail

app/locales/zh-CN.json

@@ -0,0 +1,186 @@
+{
+  "system": {
+    "modules": {
+      "BangumiModule": {
+        "name": "Bangumi"
+      },
+      "DiscordModule": {
+        "name": "Discord"
+      },
+      "DoubanModule": {
+        "name": "豆瓣"
+      },
+      "EmbyModule": {
+        "name": "Emby"
+      },
+      "FanartModule": {
+        "name": "Fanart"
+      },
+      "FeishuModule": {
+        "name": "飞书"
+      },
+      "FileManagerModule": {
+        "name": "文件整理"
+      },
+      "FilterModule": {
+        "name": "过滤器"
+      },
+      "IndexerModule": {
+        "name": "站点索引"
+      },
+      "JellyfinModule": {
+        "name": "Jellyfin"
+      },
+      "PlexModule": {
+        "name": "Plex"
+      },
+      "PostgreSQLModule": {
+        "name": "PostgreSQL"
+      },
+      "QbittorrentModule": {
+        "name": "Qbittorrent"
+      },
+      "QQBotModule": {
+        "name": "QQ"
+      },
+      "RedisModule": {
+        "name": "Redis缓存"
+      },
+      "RtorrentModule": {
+        "name": "Rtorrent"
+      },
+      "SlackModule": {
+        "name": "Slack"
+      },
+      "SubtitleModule": {
+        "name": "站点字幕"
+      },
+      "SynologyChatModule": {
+        "name": "Synology Chat"
+      },
+      "TelegramModule": {
+        "name": "Telegram"
+      },
+      "TheMovieDbModule": {
+        "name": "TheMovieDb"
+      },
+      "TheTvDbModule": {
+        "name": "TheTvDb"
+      },
+      "TransmissionModule": {
+        "name": "Transmission"
+      },
+      "TrimeMediaModule": {
+        "name": "飞牛影视"
+      },
+      "UgreenModule": {
+        "name": "绿联影视"
+      },
+      "VoceChatModule": {
+        "name": "VoceChat"
+      },
+      "WebPushModule": {
+        "name": "WebPush"
+      },
+      "WechatModule": {
+        "name": "企业微信"
+      },
+      "WechatClawBotModule": {
+        "name": "微信 ClawBot"
+      },
+      "ZSpaceModule": {
+        "name": "极影视"
+      }
+    },
+    "module_test": {
+      "unsupported": "模块不支持测试"
+    }
+  },
+  "messages": {
+    "模块不支持测试": "模块不支持测试",
+    "网络请求失败": "网络请求失败",
+    "豆瓣网络连接失败": "豆瓣网络连接失败",
+    "Bangumi网络连接失败": "Bangumi网络连接失败",
+    "fanart网络连接失败": "fanart网络连接失败",
+    "未配置站点或未通过用户认证": "未配置站点或未通过用户认证",
+    "Redis连接失败，请检查配置": "Redis连接失败，请检查配置"
+  },
+  "message_patterns": [
+    {
+      "source": "无法连接Qbittorrent下载器：{name}",
+      "target": "无法连接Qbittorrent下载器：{name}"
+    },
+    {
+      "source": "无法连接Transmission下载器：{name}",
+      "target": "无法连接Transmission下载器：{name}"
+    },
+    {
+      "source": "无法连接rTorrent下载器：{name}",
+      "target": "无法连接rTorrent下载器：{name}"
+    },
+    {
+      "source": "无法连接Emby服务器：{name}",
+      "target": "无法连接Emby服务器：{name}"
+    },
+    {
+      "source": "无法连接Jellyfin服务器：{name}",
+      "target": "无法连接Jellyfin服务器：{name}"
+    },
+    {
+      "source": "无法连接Plex服务器：{name}",
+      "target": "无法连接Plex服务器：{name}"
+    },
+    {
+      "source": "飞牛影视配置不完整：{name}",
+      "target": "飞牛影视配置不完整：{name}"
+    },
+    {
+      "source": "无法连接飞牛影视：{name}",
+      "target": "无法连接飞牛影视：{name}"
+    },
+    {
+      "source": "绿联影视配置不完整：{name}",
+      "target": "绿联影视配置不完整：{name}"
+    },
+    {
+      "source": "无法连接绿联影视：{name}",
+      "target": "无法连接绿联影视：{name}"
+    },
+    {
+      "source": "无法连接极影视服务器：{name}",
+      "target": "无法连接极影视服务器：{name}"
+    },
+    {
+      "source": "Telegram {name} 未就绪",
+      "target": "Telegram {name} 未就绪"
+    },
+    {
+      "source": "飞书 {name} 未就绪",
+      "target": "飞书 {name} 未就绪"
+    },
+    {
+      "source": "Discord {name} Bot 未就绪",
+      "target": "Discord {name} Bot 未就绪"
+    },
+    {
+      "source": "Slack {name} 未就绪",
+      "target": "Slack {name} 未就绪"
+    },
+    {
+      "source": "无法连接Bangumi，错误码：{code}",
+      "target": "无法连接Bangumi，错误码：{code}"
+    },
+    {
+      "source": "无法连接fanart，错误码：{code}",
+      "target": "无法连接fanart，错误码：{code}"
+    },
+    {
+      "source": "无法连接 {domain}，错误码：{code}",
+      "target": "无法连接 {domain}，错误码：{code}"
+    },
+    {
+      "source": "{domain} 网络连接失败",
+      "target": "{domain} 网络连接失败"
+    }
+  ]
+}

app/schemas/dashboard.py

@@ -1,6 +1,8 @@
 from typing import Optional
 
-from pydantic import BaseModel, Field
+from pydantic import BaseModel, Field, model_validator
+
+from app.helper.locale import LocaleHelper
 
 
 class Statistic(BaseModel):
@@ -87,14 +89,20 @@ class ScheduleProgress(BaseModel):
     id: Optional[str] = None
     # 名称
     name: Optional[str] = None
+    # 多语言名称
+    name_i18n: Optional[str] = None
     # 提供者
     provider: Optional[str] = None
+    # 多语言提供者
+    provider_i18n: Optional[str] = None
     # 是否正在执行
     enable: Optional[bool] = False
     # 当前完成百分比
     value: Optional[float] = 0.0
     # 当前进度文本
     text: Optional[str] = None
+    # 多语言进度文本
+    text_i18n: Optional[str] = None
     # 执行状态 waiting/running/success/failed
     status: Optional[str] = None
     # 最近一次执行是否成功
@@ -105,9 +113,27 @@ class ScheduleProgress(BaseModel):
     finished_at: Optional[str] = None
     # 最近一次错误信息
     error: Optional[str] = None
+    # 多语言错误信息
+    error_i18n: Optional[str] = None
     # 扩展数据
     data: Optional[dict] = Field(default_factory=dict)
 
+    @model_validator(mode="after")
+    def fill_i18n_fields(self) -> "ScheduleProgress":
+        """
+        自动补充后台服务进度的多语言展示字段。
+        """
+        locale = LocaleHelper.get_current_locale()
+        if self.name and self.name_i18n is None:
+            self.name_i18n = LocaleHelper.translate_text(self.name, locale=locale)
+        if self.provider and self.provider_i18n is None:
+            self.provider_i18n = LocaleHelper.translate_text(self.provider, locale=locale)
+        if self.text and self.text_i18n is None:
+            self.text_i18n = LocaleHelper.translate_text(self.text, locale=locale)
+        if self.error and self.error_i18n is None:
+            self.error_i18n = LocaleHelper.translate_text(self.error, locale=locale)
+        return self
+
 
 class ScheduleInfo(BaseModel):
     """仪表板后台服务信息。"""
@@ -116,21 +142,49 @@ class ScheduleInfo(BaseModel):
     id: Optional[str] = None
     # 名称
     name: Optional[str] = None
+    # 多语言名称
+    name_i18n: Optional[str] = None
     # 提供者
     provider: Optional[str] = None
+    # 多语言提供者
+    provider_i18n: Optional[str] = None
     # 状态
     status: Optional[str] = None
+    # 多语言状态
+    status_i18n: Optional[str] = None
     # 下次执行时间
     next_run: Optional[str] = None
+    # 多语言下次执行时间
+    next_run_i18n: Optional[str] = None
     # 当前完成百分比
     progress: Optional[float] = 0.0
     # 进度文本
     progress_text: Optional[str] = None
+    # 多语言进度文本
+    progress_text_i18n: Optional[str] = None
     # 是否正在更新进度
     progress_enable: Optional[bool] = False
     # 进度详情
     progress_detail: Optional[ScheduleProgress] = None
 
+    @model_validator(mode="after")
+    def fill_i18n_fields(self) -> "ScheduleInfo":
+        """
+        自动补充后台服务列表的多语言展示字段。
+        """
+        locale = LocaleHelper.get_current_locale()
+        if self.name and self.name_i18n is None:
+            self.name_i18n = LocaleHelper.translate_text(self.name, locale=locale)
+        if self.provider and self.provider_i18n is None:
+            self.provider_i18n = LocaleHelper.translate_text(self.provider, locale=locale)
+        if self.status and self.status_i18n is None:
+            self.status_i18n = LocaleHelper.translate_text(self.status, locale=locale)
+        if self.next_run and self.next_run_i18n is None:
+            self.next_run_i18n = LocaleHelper.translate_text(self.next_run, locale=locale)
+        if self.progress_text and self.progress_text_i18n is None:
+            self.progress_text_i18n = LocaleHelper.translate_text(self.progress_text, locale=locale)
+        return self
+
 
 class DashboardSystemInfo(BaseModel):
     """仪表板系统摘要信息。"""

app/schemas/response.py

@@ -1,12 +1,29 @@
 from typing import Optional, Union
 
-from pydantic import BaseModel, Field
+from pydantic import BaseModel, Field, model_validator
+
+from app.helper.locale import LocaleHelper
 
 
 class Response(BaseModel):
+    """通用接口响应结构"""
+
     # 状态
     success: bool
     # 消息文本
     message: Optional[str] = None
+    # 多语言消息文本
+    message_i18n: Optional[str] = None
     # 数据
     data: Optional[Union[dict, list]] = Field(default_factory=dict)
+
+    @model_validator(mode="after")
+    def fill_message_i18n(self) -> "Response":
+        """
+        自动补充响应消息的多语言文本。
+        """
+        if self.message and self.message_i18n is None:
+            self.message_i18n = LocaleHelper.translate_text(
+                self.message, locale=LocaleHelper.get_current_locale()
+            )
+        return self

docs/mcp-api.md

@@ -86,6 +86,10 @@ MCP 使用系统配置中的 `API_TOKEN` 作为认证密钥，文档中的 API K
 
 MoviePilot 也提供普通 REST API 给前端和自动化客户端使用。所有接口同样需要 API KEY 认证，在请求头中添加 `X-API-KEY: <api_key>` 或在查询参数中添加 `apikey=<api_key>`。
 
+标准 REST 响应包含 `success`、`message`、`message_i18n`、`data` 字段。为兼容 App 和第三方客户端，`message` 继续保留原中文或原始后端文本；新版前端可发送 `X-MoviePilot-Locale: zh-CN|zh-TW|en-US` 或 `Accept-Language`，并优先展示 `message_i18n`。未提供语言头或翻译缺失时，`message_i18n` 会回退为原文本。
+
+FastAPI 异常响应保留 `detail` 字段，并在错误详情为文本时返回 `detail_i18n`；新版前端优先展示 `detail_i18n`，缺失时回退 `detail`。
+
 #### 搜索 / 种子 / 字幕
 
 | 方法 | 路径 | 说明 |
@@ -127,6 +131,8 @@ MoviePilot 也提供普通 REST API 给前端和自动化客户端使用。所
 | GET | `/api/v1/dashboard/schedule2/{job_id}/progress` | 使用 API_TOKEN 查询指定后台定时服务的实时进度详情 |
 | GET | `/api/v1/system/setting/public/{key}` | 登录用户读取白名单内非敏感系统设置，仅支持目录、存储、站点范围、默认订阅规则、Follow 订阅者和插件市场地址等前端必需配置 |
 | POST | `/api/v1/system/setting/PLUGIN_MARKET/sync-wiki` | 管理员从 MoviePilot Wiki 的插件文档同步公开插件仓库清单，和本地 `PLUGIN_MARKET` 合并去重后写入配置 |
+| GET | `/api/v1/system/modulelist` | 查询已加载模块，保留 `name` 原始中文字段，并提供 `name_i18n` 和 `name_key` 给多语言前端展示 |
+| GET | `/api/v1/system/moduletest/{moduleid}` | 测试指定模块可用性，保留原 `message`，并在标准响应顶层返回 `message_i18n` |
 
 ### 插件补充接口
 

tests/test_locale_helper.py

@@ -0,0 +1,366 @@
+import ast
+import asyncio
+import json
+from pathlib import Path
+from types import SimpleNamespace
+
+from fastapi import HTTPException
+
+from app.factory import localized_http_exception_handler
+from app.helper.locale import LocaleHelper
+from app.helper.progress import ProgressHelper
+from app.schemas.dashboard import ScheduleInfo, ScheduleProgress
+from app.schemas.response import Response
+
+
+def _has_chinese(text: str) -> bool:
+    """判断文本是否包含中文字符。"""
+    return any("\u4e00" <= char <= "\u9fff" for char in text)
+
+
+def _sample_message_expression(value: ast.AST) -> list[str]:
+    """从接口 message 表达式中生成用于翻译校验的样本文本。"""
+    if isinstance(value, ast.Constant) and isinstance(value.value, str):
+        return [value.value]
+    if isinstance(value, ast.JoinedStr):
+        parts = []
+        has_chinese = False
+        index = 0
+        for item in value.values:
+            if isinstance(item, ast.Constant) and isinstance(item.value, str):
+                parts.append(item.value)
+                has_chinese = has_chinese or _has_chinese(item.value)
+            else:
+                index += 1
+                parts.append(f"样例{index}")
+        return ["".join(parts)] if has_chinese else []
+    if isinstance(value, ast.IfExp):
+        return _sample_message_expression(value.body) + _sample_message_expression(value.orelse)
+    if isinstance(value, ast.BoolOp):
+        samples = []
+        for item in value.values:
+            samples.extend(_sample_message_expression(item))
+        return samples
+    if isinstance(value, ast.BinOp) and isinstance(value.op, ast.Add):
+        left_samples = _sample_message_expression(value.left)
+        right_samples = _sample_message_expression(value.right)
+        if left_samples and right_samples:
+            return [left + right for left in left_samples for right in right_samples]
+        if left_samples:
+            return [f"{left}样例" for left in left_samples]
+        if right_samples:
+            return [f"样例{right}" for right in right_samples]
+    return []
+
+
+def test_locale_helper_normalizes_supported_aliases():
+    """语言别名应规范化为项目支持的语言标识。"""
+    assert LocaleHelper.normalize_locale("en") == "en-US"
+    assert LocaleHelper.normalize_locale("zh_Hant") == "zh-TW"
+    assert LocaleHelper.normalize_locale("unknown") == "zh-CN"
+
+
+def test_locale_helper_reads_request_headers_by_priority():
+    """请求语言应优先使用显式前端语言头，再回退 Accept-Language。"""
+    request = SimpleNamespace(
+        headers={
+            "x-moviepilot-locale": "en-US",
+            "accept-language": "zh-TW,zh;q=0.9",
+        }
+    )
+
+    assert LocaleHelper.get_locale_from_request(request) == "en-US"
+
+
+def test_locale_helper_reads_query_locale_before_headers():
+    """SSE 请求可通过查询参数显式指定前端语言。"""
+    request = SimpleNamespace(
+        query_params={"locale": "zh-TW"},
+        headers={
+            "x-moviepilot-locale": "en-US",
+            "accept-language": "en-US",
+        },
+    )
+
+    assert LocaleHelper.get_locale_from_request(request) == "zh-TW"
+
+
+def test_locale_helper_parses_accept_language_quality():
+    """Accept-Language 应按 q 权重选择支持的语言。"""
+    request = SimpleNamespace(
+        headers={
+            "accept-language": "fr-FR, en-US;q=0.8, zh-TW;q=0.9",
+        }
+    )
+
+    assert LocaleHelper.get_locale_from_request(request) == "zh-TW"
+
+
+def test_locale_helper_translates_module_name_and_keeps_missing_text():
+    """翻译存在时返回目标语言，缺失时返回默认文本。"""
+    assert LocaleHelper.translate(
+        "system.modules.DoubanModule.name",
+        locale="en-US",
+        default="豆瓣",
+    ) == "Douban"
+    assert LocaleHelper.translate_text("模块不支持测试", locale="en-US") == "Module does not support testing"
+    assert LocaleHelper.translate_text(
+        "requirements.txt 文件下载失败", locale="en-US"
+    ) == "Failed to download requirements.txt"
+    assert LocaleHelper.translate_text("未收录的中文错误", locale="en-US") == "未收录的中文错误"
+
+
+def test_locale_helper_translates_dynamic_message_patterns():
+    """动态消息应保留变量并翻译模板文本。"""
+    assert LocaleHelper.translate_text(
+        "无法连接Qbittorrent下载器：默认",
+        locale="en-US",
+    ) == "Unable to connect to qBittorrent downloader: 默认"
+    assert LocaleHelper.translate_text(
+        "无法连接 api.themoviedb.org，错误码：403",
+        locale="en-US",
+    ) == "Unable to connect to api.themoviedb.org, error code: 403"
+    assert LocaleHelper.translate_text(
+        "飞书 工作 未就绪",
+        locale="zh-TW",
+    ) == "飛書 工作 尚未就緒"
+
+
+def test_locale_helper_translates_common_backend_response_messages():
+    """常见后端链路消息应能生成英文展示文本。"""
+    samples = {
+        "QQ Bot 默认 未就绪": "QQ Bot 默认 is not ready",
+        "微信 ClawBot 工作 未就绪：未登录": "WeChat ClawBot 工作 is not ready: 未登录",
+        "无法打开网站！": "Unable to open the site!",
+        "错误：403 Forbidden": "Error: 403 Forbidden",
+        "站点【https://example.com】不存在": "Site [https://example.com] does not exist",
+        "下载字幕文件失败，状态码：404 Not Found": "Failed to download subtitle file, status code: 404 Not Found",
+        "未获取到第 2 季的总集数": "Unable to get the total episode count for season 2",
+        "电影.mkv 已在整理队列中": "电影.mkv is already in the organization queue",
+        "未识别到媒体信息，类型：电视剧，id：123": "Unable to recognize media information, type: 电视剧, id: 123",
+        "默认 的下载目录 /downloads 不存在": "Download directory for 默认 does not exist: /downloads",
+        "不支持 Local 到 Alist 的文件整理": "File organization from Local to Alist is not supported",
+        "文件 /tmp/a.mkv 不存在": "File /tmp/a.mkv does not exist",
+        "添加种子任务失败：种子无效": "Failed to add torrent task: 种子无效",
+        "检查授权状态失败: timeout": "Failed to check authorization status: timeout",
+        "未找到名为 工作 的微信 ClawBot 通知配置": (
+            "No WeChat ClawBot notification configuration named 工作 was found"
+        ),
+        "整理记录不存在: 1, 2": "Organization record does not exist: 1, 2",
+        "插件要求 MoviePilot 版本 >=2.14.0，当前版本 2.13.0 不满足，已拒绝安装": (
+            "The plugin requires MoviePilot version >=2.14.0, but current version 2.13.0 "
+            "does not satisfy it. Installation was rejected"
+        ),
+        "已安排一次性 release 升级并重启": "Scheduled one-shot release upgrade and restart",
+        "已将微信 ClawBot 登录缓存从 old 迁移到 new": (
+            "Migrated WeChat ClawBot login cache from old to new"
+        ),
+        "搜索完成，共 3 个资源": "Search completed, 3 resources",
+        "正在搜索关键字，已完成 1 / 6 个请求 ...": (
+            "Searching 关键字, completed 1/6 requests ..."
+        ),
+        "正在搜索字幕关键字，已完成 1 / 6 个请求 ...": (
+            "Searching subtitles 关键字, completed 1/6 requests ..."
+        ),
+        "未开启任何支持字幕搜索的有效站点，无法搜索字幕": (
+            "No valid subtitle-search site is enabled, unable to search subtitles"
+        ),
+        "用户名或密码错误": "Incorrect username or password",
+        "工具 'query_schedulers' 未找到": "Tool 'query_schedulers' was not found",
+        "插件 test 不存在或未加载": "Plugin test does not exist or is not loaded",
+        "站点 1 不存在": "Site 1 does not exist",
+        "智能助手未启用，请先在系统设置中开启。": (
+            "The assistant is not enabled. Enable it in system settings first."
+        ),
+        "智能助手执行失败: timeout": "Assistant execution failed: timeout",
+    }
+
+    for message, expected in samples.items():
+        assert LocaleHelper.translate_text(message, locale="en-US") == expected
+
+
+def test_response_auto_fills_message_i18n_from_locale_context():
+    """通用 Response 应根据请求语言上下文自动补充多语言消息。"""
+    token = LocaleHelper.set_current_locale("en-US")
+    try:
+        response = Response(success=False, message="模块不支持测试")
+    finally:
+        LocaleHelper.reset_current_locale(token)
+
+    assert response.message == "模块不支持测试"
+    assert response.message_i18n == "Module does not support testing"
+
+
+def test_http_exception_handler_adds_detail_i18n_from_locale_context():
+    """HTTPException 响应应补充多语言 detail 字段。"""
+    token = LocaleHelper.set_current_locale("en-US")
+    try:
+        response = asyncio.run(
+            localized_http_exception_handler(
+                None,
+                HTTPException(status_code=401, detail="用户名或密码错误"),
+            )
+        )
+    finally:
+        LocaleHelper.reset_current_locale(token)
+
+    payload = json.loads(response.body)
+    assert payload["detail"] == "用户名或密码错误"
+    assert payload["detail_i18n"] == "Incorrect username or password"
+
+
+def test_progress_helper_get_adds_i18n_fields_without_mutating_cache():
+    """通用进度字典应返回展示字段翻译，同时保留缓存中的原始中文。"""
+    progress = ProgressHelper("__test_i18n_progress")
+    progress.start()
+    progress.update(
+        text="开始同步媒体服务器，共 2 个 ...",
+        data={"error": "后台服务不存在"},
+    )
+
+    detail = progress.get(locale="en-US")
+    assert detail is not None
+    assert detail["text"] == "开始同步媒体服务器，共 2 个 ..."
+    assert detail["text_i18n"] == "Starting media server sync, 2 servers ..."
+    assert detail["data"]["error"] == "后台服务不存在"
+    assert detail["data"]["error_i18n"] == "Background service does not exist"
+
+    detail["data"]["error_i18n"] = "mutated"
+    second_detail = progress.get(locale="en-US")
+    assert second_detail is not None
+    assert second_detail["data"]["error_i18n"] == "Background service does not exist"
+
+
+def test_schedule_info_auto_fills_i18n_display_fields():
+    """后台服务数据应补充前端展示所需的多语言字段。"""
+    token = LocaleHelper.set_current_locale("en-US")
+    try:
+        schedule = ScheduleInfo(
+            id="mediaserver_sync",
+            name="同步媒体服务器",
+            provider="[系统]",
+            status="等待",
+            next_run="2小时3分钟",
+            progress_text="开始同步媒体服务器，共 2 个 ...",
+            progress_detail=ScheduleProgress(
+                id="mediaserver_sync",
+                name="同步媒体服务器",
+                provider="[系统]",
+                text="媒体服务器 Emby 无可同步媒体库",
+                error="后台服务不存在",
+            ),
+        )
+    finally:
+        LocaleHelper.reset_current_locale(token)
+
+    assert schedule.name_i18n == "Sync Media Servers"
+    assert schedule.provider_i18n == "[System]"
+    assert schedule.status_i18n == "Waiting"
+    assert schedule.next_run_i18n == "2h 3m"
+    assert schedule.progress_text_i18n == "Starting media server sync, 2 servers ..."
+    assert schedule.progress_detail.text_i18n == "Media server Emby has no libraries to sync"
+    assert schedule.progress_detail.error_i18n == "Background service does not exist"
+
+
+def test_api_endpoint_literal_messages_have_english_translations():
+    """接口直接返回的中文 message 应有英文翻译，避免前端切英文后回退中文。"""
+    untranslated = []
+    for path in Path("app/api/endpoints").glob("*.py"):
+        tree = ast.parse(path.read_text())
+        for node in ast.walk(tree):
+            if not isinstance(node, ast.Call):
+                continue
+            for keyword in node.keywords:
+                if keyword.arg != "message":
+                    continue
+                value = keyword.value
+                if not isinstance(value, ast.Constant) or not isinstance(value.value, str):
+                    continue
+                message = value.value
+                if not any("\u4e00" <= char <= "\u9fff" for char in message):
+                    continue
+                translated = LocaleHelper.translate_text(message, locale="en-US")
+                if translated == message:
+                    untranslated.append(f"{path}:{value.lineno}:{message}")
+
+    assert untranslated == []
+
+
+def test_api_endpoint_dynamic_messages_have_english_translations():
+    """接口动态拼接的中文 message 应由模板翻译覆盖。"""
+    untranslated = []
+    for path in Path("app/api/endpoints").glob("*.py"):
+        tree = ast.parse(path.read_text())
+        for node in ast.walk(tree):
+            if not isinstance(node, ast.Call):
+                continue
+            for keyword in node.keywords:
+                if keyword.arg != "message":
+                    continue
+                value = keyword.value
+                if not isinstance(value, ast.JoinedStr):
+                    continue
+                parts = []
+                has_chinese = False
+                index = 0
+                for item in value.values:
+                    if isinstance(item, ast.Constant) and isinstance(item.value, str):
+                        parts.append(item.value)
+                        has_chinese = has_chinese or _has_chinese(item.value)
+                    else:
+                        index += 1
+                        parts.append(f"样例{index}")
+                if not has_chinese:
+                    continue
+                message = "".join(parts)
+                translated = LocaleHelper.translate_text(message, locale="en-US")
+                if translated == message:
+                    untranslated.append(f"{path}:{value.lineno}:{message}")
+
+    assert untranslated == []
+
+
+def test_api_endpoint_message_expressions_have_english_translations():
+    """接口 message 表达式中的中文分支应有英文翻译。"""
+    untranslated = []
+    for path in Path("app/api/endpoints").glob("*.py"):
+        tree = ast.parse(path.read_text())
+        for node in ast.walk(tree):
+            if not isinstance(node, ast.Call):
+                continue
+            if ast.unparse(node.func) not in {"schemas.Response", "Response"}:
+                continue
+            for keyword in node.keywords:
+                if keyword.arg != "message":
+                    continue
+                for message in _sample_message_expression(keyword.value):
+                    if not _has_chinese(message):
+                        continue
+                    translated = LocaleHelper.translate_text(message, locale="en-US")
+                    if translated == message:
+                        untranslated.append(f"{path}:{keyword.value.lineno}:{message}")
+
+    assert untranslated == []
+
+
+def test_api_endpoint_http_exception_details_have_english_translations():
+    """HTTPException 的中文 detail 应有英文翻译。"""
+    untranslated = []
+    for path in Path("app/api/endpoints").glob("*.py"):
+        tree = ast.parse(path.read_text())
+        for node in ast.walk(tree):
+            if not isinstance(node, ast.Call):
+                continue
+            if not ast.unparse(node.func).endswith("HTTPException"):
+                continue
+            for keyword in node.keywords:
+                if keyword.arg != "detail":
+                    continue
+                for message in _sample_message_expression(keyword.value):
+                    if not _has_chinese(message):
+                        continue
+                    translated = LocaleHelper.translate_text(message, locale="en-US")
+                    if translated == message:
+                        untranslated.append(f"{path}:{keyword.value.lineno}:{message}")
+
+    assert untranslated == []

tests/test_system_i18n.py

@@ -0,0 +1,111 @@
+from types import ModuleType
+from unittest.mock import patch
+
+from app.helper.locale import LocaleHelper
+from app.testing import stub_modules
+
+
+def _stub(name: str, **attrs) -> tuple:
+    """构造带指定属性的占位模块，返回给 stub_modules 使用。"""
+    module = ModuleType(name)
+    for key, value in attrs.items():
+        setattr(module, key, value)
+    return name, module
+
+
+class _Dummy:
+    """隔离 system endpoint 导入期重依赖的占位对象。"""
+
+    def __init__(self, *args, **kwargs):
+        pass
+
+    def __getattr__(self, _name):
+        return lambda *args, **kwargs: None
+
+
+class _FakeDoubanModule:
+    """构造带中文名称的模块类，模拟真实 DoubanModule。"""
+
+    @staticmethod
+    def get_name() -> str:
+        """获取模块中文名称"""
+        return "豆瓣"
+
+
+class _FakeModuleManager:
+    """提供 system 模块接口测试所需的最小模块管理器。"""
+
+    def get_modules(self) -> dict:
+        """返回模块字典"""
+        return {"DoubanModule": _FakeDoubanModule}
+
+    def test(self, moduleid: str) -> tuple[bool, str]:
+        """返回模块测试结果"""
+        return False, "模块不支持测试"
+
+
+_STUB_MODULES = dict([
+    _stub("pillow_avif"),
+    _stub("aiofiles"),
+    _stub("psutil"),
+    _stub("app.helper.sites", SitesHelper=_Dummy),
+    _stub("app.chain.media", MediaChain=_Dummy),
+    _stub("app.chain.mediaserver", MediaServerChain=_Dummy),
+    _stub("app.chain.search", SearchChain=_Dummy),
+    _stub("app.chain.system", SystemChain=_Dummy),
+    _stub("app.core.event", eventmanager=_Dummy(), Event=_Dummy, EventManager=_Dummy),
+    _stub("app.core.metainfo", MetaInfo=_Dummy),
+    _stub("app.core.module", ModuleManager=_Dummy),
+    _stub("app.core.security", verify_apitoken=_Dummy, verify_resource_token=_Dummy, verify_token=_Dummy),
+    _stub("app.db.models", User=_Dummy),
+    _stub("app.db.systemconfig_oper", SystemConfigOper=_Dummy),
+    _stub("app.db.user_oper", get_current_active_superuser=_Dummy,
+          get_current_active_superuser_async=_Dummy, get_current_active_user_async=_Dummy),
+    _stub("app.helper.image", ImageHelper=_Dummy),
+    _stub("app.helper.mediaserver", MediaServerHelper=_Dummy),
+    _stub("app.helper.message", MessageHelper=_Dummy),
+    _stub("app.helper.progress", ProgressHelper=_Dummy),
+    _stub("app.helper.rule", RuleHelper=_Dummy),
+    _stub("app.helper.server", MoviePilotServerHelper=_Dummy),
+    _stub("app.helper.system", SystemHelper=_Dummy),
+    _stub("app.log", logger=_Dummy(), log_settings=_Dummy(),
+          LogConfigModel=type("LogConfigModel", (), {})),
+    _stub("app.scheduler", Scheduler=_Dummy),
+    _stub("app.utils.crypto", HashUtils=_Dummy),
+    _stub("app.utils.http", RequestUtils=_Dummy, AsyncRequestUtils=_Dummy),
+    _stub("version", APP_VERSION="test"),
+])
+
+
+with stub_modules(_STUB_MODULES):
+    from app.api.endpoints import system as system_endpoint
+
+
+def test_system_modulelist_keeps_chinese_name_and_adds_i18n_name():
+    """模块列表接口应保留旧中文字段，并提供前端可用的多语言字段。"""
+    token = LocaleHelper.set_current_locale("en-US")
+    with patch.object(system_endpoint, "ModuleManager", return_value=_FakeModuleManager()):
+        try:
+            response = system_endpoint.modulelist(_="token")
+        finally:
+            LocaleHelper.reset_current_locale(token)
+
+    module = response.data["modules"][0]
+    assert module["id"] == "DoubanModule"
+    assert module["name"] == "豆瓣"
+    assert module["name_i18n"] == "Douban"
+    assert module["name_key"] == "system.modules.DoubanModule.name"
+
+
+def test_system_moduletest_keeps_chinese_message_and_adds_i18n_message():
+    """模块测试接口应保留旧中文 message，并在顶层提供多语言 message_i18n。"""
+    token = LocaleHelper.set_current_locale("en-US")
+    with patch.object(system_endpoint, "ModuleManager", return_value=_FakeModuleManager()):
+        try:
+            response = system_endpoint.moduletest("DoubanModule", _="token")
+        finally:
+            LocaleHelper.reset_current_locale(token)
+
+    assert response.success is False
+    assert response.message == "模块不支持测试"
+    assert response.message_i18n == "Module does not support testing"