This string is hardcoded and cannot be translated

Hello.

As per Prime Slider Addons for Elementor, this string is hard-coded in this .css file and cannot be translated:

elementor-panel #elementor-controls .pg-disabled-control .elementor-control-field:after{content:"This is a pro control, available with Pixel Gallery Pro version.";

https://plugins.trac.wordpress.org/browser/pixel-gallery/tags/2.1.7/assets/css/pg-editor.css

Thanks.