Changing 'Sq ft' Text in Widget Area?

Having a little difficulty still, trying to change the ‘Sq ft’ text on the Widget area, I have found the code in class-featured-listings-widget.php.

I would like to change ‘Sq ft’ to ‘Build Size’, any suggestions?

if ( '' != get_post_meta( $post->ID, '_listing_bedrooms', true ) || '' != get_post_meta( $post->ID, '_listing_bathrooms', true ) || '' != get_post_meta( $post->ID, '_listing_sqft', true )) {
					$loop .= sprintf( '<ul class="listing-beds-baths-sqft"><li class="beds">%s<span>Beds</span></li> <li class="baths">%s<span>Baths</span></li> <li class="sqft">%s<span>Sq ft</span></li></ul>', get_post_meta( $post->ID, '_listing_bedrooms', true ), get_post_meta( $post->ID, '_listing_bathrooms', true ), get_post_meta( $post->ID, '_listing_sqft', true ) );
				}

I have also attached a screenshot of the widget area on the site I’m working on: http://postimg.org/image/f94w7gfwb/

https://wordpress.org/plugins/wp-listings/