[FIX] base: missing import _() in base_module_upgrade

lp bug: https://launchpad.net/bugs/685949 fixed

bzr revid: odo@openerp.com-20101206141053-ckisp97vg8herdnr

bin/addons/base/module/wizard/base_module_upgrade.py

@@ -20,8 +20,8 @@
 ##############################################################################
 
 import pooler
-import wizard
 from osv import osv, fields
+from tools.translate import _
 
 class base_module_upgrade(osv.osv_memory):
     """ Module Upgrade """