If you wanted, you could create a new translation file (i.e. with a program like Poedit) that includes the wording you want. Or you could edit it directly in the plugin code. This string is found in the “DisplayFAQs.php” file in the “Shortcodes” folder.
Alternatively, if you’re using the premium version of the plugin, you can easily change the wording of this text in the “Labelling” area of the “Settings” tab.