Ok. The current version of my distribution does not contain KF5 Plasma.
Any user with appropriate iconset installed can replace the icons on wiki page. It's wiki, it was created to attract more users, not just for users tell others what to do. Want to change something? Come on, just do it!
I can't find the way how to do this actually. And also wanted to know other members' opinion. ː)
I have some troubles using this method. The following warnings are appearing and uploading stopsː
Ok. There must be a bug (as I cannot update the file either). I have already asked webadmin to fix it.