SMTP page appears broken when language is French (JS issue)
On the SMTP settings admin page, there's a warning when you switch from Redirect to database to a live mode. In French language, the translation has double-quotes, but js-escaping does single quotes and expects the terminator to be single quotes.
To reproduce, switch language to french and visit the admin smtp settings page. Look in the browser javascript console and you'll see the error.
The issue is located here
@DaveD was kind enough and quick enough to produce a PR for this: https://github.com/civicrm/civicrm-core/pull/17315 so all credit goes to him.