As a follow-up, I should mention that I corrected my Invoice page by searching for:

PHP Code:
'<td align="right" class="'str_replace('_''-'$order->totals[$i]['class']) . '-Text">' $display_title '</td>' "\n" 
and replaced it with:

PHP Code:
'<td align="right" class="'str_replace('_''-'$order->totals[$i]['class']) . '-Text">' $order->totals[$i]['title'] . '</td>' "\n" 
I also updated the Packing Slip by searching for:

PHP Code:
$format_shipping explode(" ("$order->totals[$i]['title'], 2);
$shipping_method rtrim($format_shipping[0], ":"); 
...and replacing it with:

PHP Code:
//$format_shipping = explode(" (", $order->totals[$i]['title'], 2);
//$shipping_method = rtrim($format_shipping[0], ":");
$shipping_method rtrim($order->totals[$i]['title'], ":");