Change the nature of Lexicon Item's property_sheet and class properties from...

Change the nature of Lexicon Item's property_sheet and class properties from categories to string & lines. Update of forms to follow these changes.


git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@2431 20353a03-c40f-0410-a6d1-a30d3c3de9de