Save button

no problem
but for your url kleszewski.hs6.linux.pl/projekt70/administrator, I got this message

Not Found
The requested URL /installation/offline.html was not found on this server.

Not Found
The requested URL /installation/offline.html was not found on this server.

I will check it in a moment. The link is http. without ssl. Maybe that is why it treats him as potentially dangerous. This link works for me

I think that you still have a "installation" folder in your website
I have tried http and https without success

I asked a few people who can see this message what you see. It looks like it's some kind of problem with the server. Installation folder deleted long ago. But why it only works for me, it must be the provider's server's fault. I will contact them

I solved the button problem. I passed the php version from 8.0 to 7.4 on the server and the buttons appeared
This php version changed everything, it looks like it. When version 8.0 is set, the save messages disappear, and when version 7.4 is set they pop up and everything is fine.

Isn't that great


ok.Now the page should be available.

thanks ! switched to PHP8 and I got the same problem
I will work on that and I will let you know