I feel like I've done something obviously wrong, I've double-checked everying, I'm thinking maybe it's the potd_image.html that I messed up, so here it is. I still don't have any text showing up unless I write it in to this file manually.
<strong>{lang_potd_title}</strong><br /><br />
<div align="center"><span class="thumb">{thumbnail}</span><br />
{lang_potd_type}</div>