XWIKI-9696: The title of the main page of a created wiki is badly displayed in the search results.

* Changing the title of the subwiki main page.
XWIKI-9696: The title of the main page of a created wiki is badly displayed in the search results.
Merge pull request #221 from gdelhumeau/XWIKI-9696

XWIKI-9696: The title of the main page of a created wiki is badly displayed in the search results.
* Changing the title of the subwiki main page.