I found the part that's responsible for displaying the data but I don't know how to set the correct if-condition in PHP.
I just need something like "if album-title=('music') echo ... ('Songs')" so to speak...
`
<li class="counts <?php if (($zpmas_thumbsize == 'small') && (getNumAlbums() > 0)) echo 'smallthumbs'; ?>">
<?php if (getNumAlbums() > 0) { echo getNumAlbums().' '.gettext('subalbums'); } ?>
<?php if (getNumImages() > 0) { echo getNumImages().' '.gettext('images'); } ?>
`
I've exchanged 'images' with 'files' and it works so this is the right part to change.