[FIX] ir.translation: coerce source terms into unicode, to avoid transmitting invalid UTF-8 bytes

This may happen when trying to translate already translated terms, such as the locale-dependen values provided by strftime

lp bug: https://launchpad.net/bugs/610883 fixed

bzr revid: odo@openerp.com-20101230032017-g2r9xx1mu1u5w94g

bin/addons/base/ir/ir_translation.py

@@ -158,7 +158,7 @@ class ir_translation(osv.osv):
                        WHERE lang=%s 
                         AND type in %s 
                         AND src=%s"""
-            params = (lang or '', types, source)
+            params = (lang or '', types, tools.ustr(source))
             if name:
                 query += " AND name=%s"
                 params += (tools.ustr(name),)