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To change the Modal Add / Edit Button Label,

Sample Code Snippet

add_filter( 'gpnf_init_script_args', function( $args ) {
	$args['modalLabels']['title'] = 'Add Player';
	$args['modalLabels']['editTitle'] = 'Edit Player';
	return $args;
} );

GP Nested Forms – Change Submit Button Text for Child Form – Used Code

add_filter( 'gpnf_init_script_args', function( $args ) {
	/*$args['modalLabels']['title'] = 'Add Player';*/
	/*$args['modalLabels']['editTitle'] = 'Save Product';*/
	$args['modalLabels']['editModalTitle']  = 'Edit Product';
	$args['modalLabels']['editTitle']  = 'Save Product';
	return $args;
} );

Source : https://gravitywiz.com/documentation/gpnf_init_script_args/