Sorting natural-nohtml not working

Hello,

i need to sort column 0 "Názov" as string. By default type its not working. I tried natural-nohtml but still not working. Here is screenshot of preview or sort.

My wrong sort:
IMG_20180727_121030.jpg
IMG_20180727_140931.jpg
IMG_20180727_115842.jpg
IMG_20180727_120503.jpg
IMG_20180727_145237.jpg

Right sort is:
IMG_20180727_115842.jpg
IMG_20180727_120503.jpg
IMG_20180727_121030.jpg
IMG_20180727_140931.jpg
IMG_20180727_145237.jpg

Here is example with few rows:
https://pastebin.com/CyL4h3zJ

Here is my script definition of table:
https://pastebin.com/B8LERv58

Here is the test case:
http://live.datatables.net/mafoyeja/1/

Thank you for any advice.