Added Dependency to erp5 _trade.

Fix description typo

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@21273 20353a03-c40f-0410-a6d1-a30d3c3de9de

bt5/erp5_item/bt/dependency_list

 erp5_pdm
+erp5_trade
 erp5_core (>= 1.0rc12)
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bt5/erp5_item/bt/description

-Use to keep tracability of resources.
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+Use to keep traceability of resources.
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bt5/erp5_item/bt/revision

-29
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+33
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