Hi!
search in details.php:
$next_image_name = format_text($next_prev_cache[$next_image_id]['image_name'], 2);
insert below:
$next_image_name = substr($next_image_name,0,15);
optional, search:
$prev_image_name = format_text($next_prev_cache[$prev_image_id]['image_name'], 2);
insert below:
$prev_image_name = substr($prev_image_name,0,15);
mfg Andi