Get settings from backend, added web search functionality

lang/en-US.json

@@ -34,6 +34,7 @@
   "copied": "Copied",
   "delete": "Delete",
   "signOut": "Sign out",
+  "webSearch": "Web Search",
   "welcomeScreen": {
     "introduction1": "is an unofficial client for ChatGPT, but uses the official OpenAI API.",
     "introduction2": "You will need an OpenAI API Key before you can use this client.",

lang/zh-CN.json

@@ -34,6 +34,7 @@
   "copied": "已复制",
   "delete": "删除",
   "signOut": "退出登录",
+  "webSearch": "网页搜索",
   "welcomeScreen": {
     "introduction1": "是一个非官方的ChatGPT客户端，但使用OpenAI的官方API",
     "introduction2": "在使用本客户端之前，您需要一个OpenAI API密钥。",