You can change it using CSS like this
li.mx-listview-empty::before {
content: "Text to show as empty message here";
}
li.mx-listview-empty label {
display: none;
}
This will be for one listview to which you apply the CSS class with this CSS code.
For project wide settings, you can change it in the system text settings through Project > System texts > Listview. there's an option to change the text: