feat: add translation for register messages

public/locales/zh.json

@@ -28,7 +28,16 @@
     "register_prompt": "已有账号？",
     "login_link": "登录",
     "welcome_notification": "欢迎使用 Maxun！",
-    "error_notification": "注册失败。请重试。"
+    "validation": {
+      "email_required": "邮箱是必填项",
+      "password_requirements": "密码必须至少6个字符"
+    },
+    "error": {
+      "user_exists": "该邮箱已被注册",
+      "creation_failed": "无法创建账户",
+      "server_error": "服务器错误",
+      "generic": "注册失败，请重试"
+    }
   },
   "recordingtable": {
     "run": "运行",