po: Adjust the trailing colons and the spaces around them in the Arabic translation.

[Francois Gouget]

Sorry. I meant to CC Mosaab Alzoubi so he gets a chance to review and 
comment on this one.

Also the Style Guide has this to say about colons:
| Spacing: No space before. Space after.

http://download.microsoft.com/download/d/6/1/d6100bb3-73a8-4d26-a0e6-2c3e37d23de1/ara-sau-StyleGuide.pdf

Short and to the point<g>.

-- 
Francois Gouget <fgouget at free.fr>              http://fgouget.free.fr/
        It really galls me that most of the computer power in the world
                          is wasted on screen savers.
                     Chris Caldwell from the GIMPS project
                       http://www.mersenne.org/prime.htm