feat: search in a different language

i18n/en.json

@@ -27,7 +27,9 @@
     "webSearch": {
       "provider": "Web Search Provider",
       "providerHelp": "Currently only supports Tavily. It provides lots of free quota (1000 credits / month).\nGet one API key at {0}.",
-      "apiKey": "API Key"
+      "apiKey": "API Key",
+      "queryLanguage": "Query Language",
+      "queryLanguageHelp": "The language of the search query. Useful if you want to get search results in a different language.\nWhen writing conclusions, the AI model will still use the language same as the web UI."
     }
   },
   "researchTopic": {

i18n/zh.json

@@ -27,7 +27,9 @@
     "webSearch": {
       "provider": "联网搜索服务",
       "providerHelp": "目前仅支持 Tavily，每个月可以免费搜索 1000 次。\n请在 {0} 生成一个 API 密钥。",
-      "apiKey": "API 密钥"
+      "apiKey": "API 密钥",
+      "queryLanguage": "使用语言",
+      "queryLanguageHelp": "修改搜索词的语言。如果你想获取不同的搜索结果（比如查询高质量的英文资料），可以在这里修改。\nAI 模型在总结的时候仍然会使用当前网页的语言。"
     }
   },
   "researchTopic": {