[scribus] Update needed in 1.5.0 About screen.

[john Culleton]

Here is what the current text reads:
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......

No updates are available for your version of Scribus 1.5.0.svn
- Scribus 1.3.3.14 is the latest stable release.
- We have stabilised 1.3.3.x for those wishing to use some new features
of the 1.3.x series but need more stability.
- Scribus 1.3.8 was released 22 July 2010 
Finished
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If someone will give me the needed permissions  would be
willing to rewrite this screen.
-- 
John Culleton
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