Show locale in password entry prompt

[Rogach]

Since English is not my native language, I am forced to have several layouts configured on my system. Sometimes (by unlucky coincidence) non-English layout is selected when I lock the screen, and after I come back, I don't remember that fact. Thus, I have to re-try typing my password 2-3 times - because at first I assume that English locale is selected.
It would be nice if currently selected locale was displayed somewhere on the password prompt.

I'm using Xubuntu 12.04 and XScreenSaver version 5.15 (I looked into changelog up to 5.21, and this feature doesn't seem to be implemented).