[FIX]Add preferences for must reads feature (thanks lph and nkoth). Add some spacing below the fist description text of the wizard screen. Reduce the text needed to be translated for this screen with the info about new features.

git-svn-id: file:///var/local/code.tiki.org/tikisvn/trunk@53046 b456876b-0849-0410-b77d-98878d47e9d5
[FIX]Fix url to doc page (stub) about the 'Must Reads' feature

git-svn-id: file:///var/local/code.tiki.org/tikisvn/trunk@53047 b456876b-0849-0410-b77d-98878d47e9d5