Description of problem:

The openssh-askpass brought up a scary dialog with text like
"Could not grab keyboard - someone may be eavesdropping you". 
This happened when unlocking screen. I have a directory
mounted over ssh with fuse which wanted to reconnect and
asked for password. 

Anyway the problem is that the dialog is not very informative. 
It doesn't provide info what has caused this (i had to google
for the text to find out it was openssh-askpass) and there
are no instructions how to prevent this. 

I suggest the text is changed to something like 
"SSH password dialog could not grab the keyboard input. 
This might be caused by a bug in a application but also 
someone may be eavesdropping you. Please log out and
log in to prevent this from happening."