adds trail export

web/src/lib/i18n/locales/zh.json

@@ -55,12 +55,15 @@
   "entry": "日程",
   "error-creating-user": "创建用户错误",
   "error-during-login": "登录错误",
+  "error-exporting-trail": "",
   "error-printing-map": "",
   "error-reading-file": "读取文件错误",
   "est-duration": "预计时长",
   "explore": "探索",
   "explore-some-trails": "探索行程",
+  "export": "",
   "features": "特性",
+  "file-format": "",
   "french": "法语",
   "german": "德语",
   "grid": "",