Remove sprite-specific text from sprite/sound/etc deletion warning

src/containers/sprite-selector-item.jsx

@@ -21,7 +21,7 @@ class SpriteSelectorItem extends React.Component {
     }
     handleDelete () {
         // eslint-disable-next-line no-alert
-        if (window.confirm('Are you sure you want to delete this sprite?')) {
+        if (window.confirm('Are you sure you want to delete this?')) {
             this.props.onDeleteButtonClick(this.props.id);
         }
     }