This thread is resolved. Here is a description of the problem and solution.
Problem: While using the Avada theme, there is one content element from the page that doesn't show as translated, even if I translated it already.
Solution: The client said he solved it following the next steps: "I´ve deleted the English page and created a new one. With this, it works now again."
This is the technical support forum for WPML - the multilingual WordPress plugin.