Server Translation: Fixed the issue search on translated field do not return true result, search on tranlsated field fails due to expression parsing which fetches ids from ir_translation as well as working table and UNION of this makes search fruitless, also search fails for in language other then english when you enter part of a string for the field to search.
Merge pull request #622 from odoo-dev/7.0-opw-592890-msh

[FIX] search on translated field: Only search on source field if not translated.