You can change the settings for descriptions in your slideshowimagevueconfig.ini and/or slideshowimagevueconfig.ini.
slideshowimagevueconfig.ini is used for slideshow started from the gallery (thumbnails). slideshowimagevueconfig.ini is for the slideshow without the gallery.
Under [TEXT] you can edit this settings.
For more info:
https://www.photo.gallery/support/docs/450
For example:
http://imagevuex.inn.no/imagevue/slideshownew7.ini