Fix encoding issue #6364 of reload mode (#6622)
* fix: configure default encoding as utf-8
* apply doc change for the fix
* apply cn doc change for the fix
* add changeset
* Lint
---------
Co-authored-by: Freddy Boulton <alfonsoboulton@gmail.com>
Co-authored-by: gradio-pr-bot <gradio-pr-bot@users.noreply.github.com>
