WebFig skin design problem

Hi!

I am trying create new skin on my RB450G.

How can I change captions in IP → DHCP Server → Leases → lease → Address
??
I need to change visibility of field in lease details.

The problem is that no change is saved when i click save. Reloading the page makes everything like before saving ready skin.

It is a bug or there is no skin customization in leases?