unicode problem on account module

[Jacara]

I have account period with unicode such as "5-р сар.2012".

But convert_to_period method on account.move.line does not support unicode data. This is bug.

def convert_to_period(self, cr, uid, context=None):
        if context is None:
            context = {}
        period_obj = self.pool.get('account.period')
        #check if the period_id changed in the context from client side
        if context.get('period_id', False):
            period_id = context.get('period_id')
            if type(period_id) == str:
                ids = period_obj.search(cr, uid, [('name', 'ilike', period_id)])
                context.update({
                    'period_id': ids[0]
                })
        return context

If i search period and journal on journal item display then getting errors.

File "/openerp/addons/account/account_move_line.py", line 958, in view_header_get
    cr.execute('SELECT code FROM account_period WHERE id = %s', (context['period_id'], ))
  File "/openerp/sql_db.py", line 152, in wrapper
    return f(self, *args, **kwargs)
  File "/openerp/sql_db.py", line 212, in execute
    res = self._obj.execute(query, params)
DataError: invalid input syntax for integer: "5-р сар.2012"
LINE 1: SELECT code FROM account_period WHERE id = '5-р сар.2012'