[FIX]Usability. Attempt to clarify in International English what each option does, with simple words for new admins. Thanks jonnyb and ricks99. Feel free to improve anyone the wording while keeping a similar meaning on each option

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/12.x@48293 b456876b-0849-0410-b77d-98878d47e9d5