message: docs: support LANG environment variable
diff: @@ -35,6 +35,8 @@ if you want to use console messages in Japanese, you can use `--lang ja` option.
  npx create-kintone-app ${name} --lang ja
  ```
  +If you set `LANG` environment variable `ja_XX.XXX`, the lang option will be `ja` automatically.
  +
  ## LICENSE
  MIT License: Toru Kobayashi
  