Accessibility Issue Caused by Missing Navigation Button Text

This is a really useful plugin (thanks!) but I came across a problem today when running a site through the WAVE Web Accessibility Evaluation Tool. There were accessibiolity errors being generated due to “empty buttons”. I narrowed it down to this plugin; specifically the previous / next navigation buttons.
So I disabled the navigation arrows in the plugin settings – but that only hides the element, so the accessibility errors were still being generated. I tried a JavaScript override to dynamically add navText to the previous & next button elements and that didn’t work either. The ONLY way I could get the errors to stop was to manually edit this file: slide-anything-frontend.php line 847:
$output .= " navText : ['Previous','Next'],\n";

…and then use a huge negative text indent value in the theme’s stylesheet to hide the text on the front end. Unfortunately, this means I have to manually edit the file each time I run a plugin update.

Might I suggest one of 2 things?
1) Provide the option of button text in the dashboard plugin settings, or
2) Add Previous & Next text to the php file and then allow text visibility to be toggled on or off.

Otherwise this plugin is always going to generate accessibility errors going forward.
Thanks,
pk