Welcome to WPML support. I'd be happy to help you on this.
From what I understand it looks like an plugin option, so can you please follow the below steps and see if this helps
- Go to WPML->String Translations
- At the bottom of the String Translation table, click on “Translate link in admin screens”
- Search for the strings there and see if you can find it.
- If you are able to find it, select it and add it using “Add to string translation” button
- Click on “Return to String Translations”
- Translate it
If the above doesn't help, I suggest you to add the code to the following sandbox site for us to test hidden link
Remember to add only demo contents since it's a public site, moving the site to this sandbox site is not recommended.
Also,
- Are you using the latest versions of WPML plugins?
- Which version of PHP/MYSQL are you using?
You can easily send this information using Debug information settings from WPML.