As desktop icons don't have any purpose in the overview (except for
distracting the user), fade them out when entering the overview.
Unfortunately, the fading effect affects performance, therefore hide
icons directly when there are maximized windows on the desktop.
https://bugzilla.gnome.org/show_bug.cgi?id=600999
'workspace_relative' is used in workspace.js, not in workspacesView.js
Change a couple strings to have single quotes instead of double quotes to indicate that
they don't need to be translated.
Matching the 20091114 mockup, the default workspace view
is now a scrollable horizontal list, with a control to
switch between this and the previous grid view.
https://bugzilla.gnome.org/show_bug.cgi?id=593844
