Description:
The "Change Priority" window that prompts for the root password displays
incorrect information.

Steps to reproduced the problem:
 1. Start gnome-system-monitor
 2. In a terminal window, type:

    # nice -n 10 xclock &

 3. Click on the newly started "xclock" process.
 4. Press [Ctrl]+[R].

    A window entitled "Change Priority" is displayed.

 5. Set the "Nice Value" to 5.
 6. Click on the "Change Priority" button.

    Another window entitled "Change Priority" is displayed.

Actual Results:
The windows says: "You must be root to renice a process lower than 0. You
can enter the root password to gain the necessary permission.". This
information is incorrect.

Expected Results:
The window should say something like: "You must be root to renice a process
lower than its current nice value. You can enter the root password to gain
the necessary permission.".

Additional Information:
The renice manual page says: "Users other than the super-user may only
alter the priority of processes they own, and can only monotonically
increase their ``nice value'' within the range 0 to PRIO_MAX (20).".