Placeholder text translation doesn't appear on the Front End, only on the Back End. It's for the specific placeholder text of the search field from Ajax Search Pro Plugin.
I'll create a local copy of your website to analyze further your issue regarding the placeholder text. If you agree, please confirm that I can create the local copy to reproduce and investigate the error. Since I already have access to your website, I'll export it using All In One WP Migration 🙂
after copying your site to a local environment, I didn't have the issue. That means that the problem is being caused due to some server configuration of your website. I advise you clear and deactivate any kind of Cache you have, including the server Cache (you can usually do that by talking to your hosting provider). I hope that helps you 🙂
