Hi Claudio,
Do you mean the term “Article” used in this menu, or elsewhere?
https://i.imgur.com/FAqjwYI.png
Unfortunately there is not a built-in setting to easily modify this, as WordPress APIs make it tricky to support.
However, if you’re comfortable with advanced WP techniques, you may be able to override Snowball’s custom post type declaration by copying it to functions.php and editing it to your preferences (see https://stackoverflow.com/questions/10532766/override-a-wordpress-plugins-taxonomy-registration-setting-without-modifying-co). However, you should approach this with great caution, and in general I would recommend against this.
Hope this is helpful,
Tom
