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> 		'submit_class'         => __( 'submit' ),
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< 							<input name="submit" type="submit" id="<?php echo esc_attr( $args['id_submit'] ); ?>" value="<?php echo esc_attr( $args['label_submit'] ); ?>" />
---
> 							<input name="submit" type="submit" id="<?php echo esc_attr( $args['id_submit'] ); ?>" value="<?php echo esc_attr( $args['label_submit'] );  ?> class="<?php echo esc_attr( $args['submit_class'] );?>" />