String changes in libwnck

[Elijah Newren <newren gmail com>]

The right-click-on-window-button-in-taskbar menu items have changed to
synchronize with metacity's right-click-on-window-titlebar menu.  This
means that the strings
  "_Unroll"
  "Roll _Up"
have been removed, while
  "On _Top"
  "Move to Workspace _Left"
  "Move to Workspace R_ight"
  "Move to Workspace _Up"
  "Move to Workspace _Down"
have been added.