Oh wow, how did I not find this plugin earlier? Thank you so much!
I will certainly try to add a much translations to the list as I can. I really like to use this plugin, and thanks for the answer.
I guess I can post an update.
I solved the Catalog Price Filter, so that’s done.
I still haven’t done any progress with other two problems, but I tried to edit and directly translate the text in “ecommerce-product-catalog” in “lang” directory. That didn’t work so I’m out of ideas.