Hi,

Try to add the following PHP code snippet to the child theme functions.php file to do this

function woodmart_additional_product_tab( $tabs ) {

		$tab_title = woodmart_get_opt( 'additional_tab_title' );

		if( empty( $tab_title ) ) return $tabs;
		
		$tabs['woodmart_additional_tab'] = array(
			'title' 	=> $tab_title,
			'priority' 	=> 25,
			'callback' 	=> 'woodmart_additional_product_tab_content'
		);

		return $tabs;

	}

You can translate all theme and plugin texts via PO file in WordPress. Here is a video tutorial that should help you translate your website texts with a Loco Translate plugin https://www.youtube.com/watch?v=D3NsDdMzsls&list=PLMw6W4rAaOgKKv0oexGHzpWBg1imvrval&index=3

As for the shipping title, edit it in Theme Settings -> Product page.

Regards