Patch for USC instead Software Source in ubuntu-docs/natty

[peppe84 at linux.it]

Hi all

Software Source is not present by default in System →
Administration. This patch point to Ubuntu Software Center. Also, other
edit I have apply.

This patch edit also:
- about-ubuntu.xml: some changes for USC instead software-source
- add-applications.xml: some changes for USC instead software-source

Ciao!
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