* use existing 'language' property instead of 'language' category for Glossary Terms.
* to migrate existing Glossary Terms, please use GlossaryTerm_getDuplicateGlossaryTermList script.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@28993 20353a03-c40f-0410-a6d1-a30d3c3de9de