added Caption based on fileName

[NaGeLBaileyVT]

hey!
I needed captions on the slideshow to show proper credits, and the easiest way I found is just get it from the filename so i edited your slideshow with the option to disable or enable it!

Not the most optimal but it works. If you want i cant make it so like the indexes create the captions beforehand and access it via index Number so its less computational power.