[Resuelto] I can't find the text to translated in the strings

Background of the issue:
I am trying to translate text from French to English on a site under development using WPML. I am following the documentation at https://wpml.org/documentation/getting-started-guide/string-translation/finding-strings-that-dont-appear-on-the-string-translation-page/.

Symptoms:
I can't find the text 'Voir' in the strings for translation, even after scanning the theme and plugins.

Questions:
How to translate those texts that cannot be found?