aria labels for next and previous buttons

We need to add aria labels to the camers_next and camera_prev element.  I have looked at the code and can find those two classes mentioned only in administrator/components/com_slideshowck/views/style/tmpl/default.php.

Adding aria-label="previous slide" to the element with the class camera_prev does not cause the aria-label to get into the element on the web site.

I don't see where the code in administrator/components/com_slideshowck/views/style/tmpl/default.php can get into the code loaded at runtime.

Can someone suggest where to look and what I need to do?

Hi
Thank you for your request
I will check that during the next week and I will let you know who this could be possible.
CEd