To reset the titles in your Moon Invoice app, follow these steps:

1. Open the Moon Invoice application on your device or tap on this link.
2. Go to Settings => Edit Titles.
3. On the "Edit Titles" screen, you’ll see editable fields for various text labels.
4. To revert all changes to the default, simply click the “Reset” button at the bottom left.
5. Finally, click “Save” to apply the reset titles.
6. This will restore all default system titles for your app interface.