bugs in addgallery.php (strings for translation)

NGG version: 1.9.12
File: addgallery.php

String
php _e( 'Choose files to upload' );
must be
php _e( 'Choose files to upload', 'nggallery' );

and string
php _e('Or you can drop the files into this window.');
must be
php _e('Or you can drop the files into this window.', 'nggallery');

http://ww.wp.xz.cn/extend/plugins/nextgen-gallery/