Hi AGS ,
Thanks for letting us know about that CSS issue. We'll fix it for the next Multi-Inventory version. By now, you can fix it yourself if you add this code to your child theme's CSS file:
body #geoprompt .select2-dropdown {
background-color: white !important;
}
And regarding the translation question: all our plugins are 100% translatable using po files. You can read how to use them here.
Or, alternatively, you can just use the Loco Translate plugin for it (perhaps, this option would be the easiest).
Best Regards,
Salva.