Add Divi Gallery Overlay - Part 1

$image_output = sprintf(
				'<a href="%1$s" title="%2$s">
					<img src="%3$s" alt="%2$s" />
					<span class="et_overlay%4$s"%5$s></span>
				</a>',
				esc_attr( $full_src ),
				esc_attr( $attachment->post_title ),
				esc_attr( $thumb_src ),
				( '' !== $hover_icon ? ' et_pb_inline_icon' : '' ),
				$data_icon
			);