[Risolto] Button/Link to PDF on foreign language page, not appearing in WPML Translation Editor

Background of the issue:
I am trying to update the Library page (link nascosto) on my site (link nascosto). The page has tabs with different content, and the 2nd tab contains a list of Brochures with a short text introduction, followed by a Button/Link to PDF. This has been updated in the default language (English).

Symptoms:
On the foreign language page, the button/text is not appearing in WPML Translation Editor as an item to edit.

Questions:
Why is the Button/Link to PDF not appearing in WPML Translation Editor on the foreign language page?
How can I make the Button/Link to PDF editable in WPML Translation Editor for the foreign language page?