[CHG] set lang to False instead of en_US (already being the default language), reducing the places where this default value is set

bzr revid: guewen.baconnier@camptocamp.com-20131228203801-3z6g1bb0ggfio5x0

openerp/osv/orm.py

@@ -4169,7 +4169,7 @@ class BaseModel(object):
                             src_trans = vals[f]
                             # Inserting value to DB
                             ctx = context.copy()
-                            ctx['lang'] = 'en_US'
+                            ctx['lang'] = False
                             self.write(cr, user, ids, {f: vals[f]}, context=ctx)
                         self.pool.get('ir.translation')._set_ids(cr, user, self._name+','+f, 'model', context['lang'], ids, vals[f], src_trans)