[FIX] Fix Transsacctions in installment

closes #388

Signed-off-by: Juan José Scarafía <jjs@adhoc.com.ar>

card_installment/models/account_card_installment.py

@@ -77,5 +77,5 @@ def map_installment_values(self, amount_total):
                     'base_amount': amount_total,
                     'amount': amount,
                     'fee': amount - amount_total,
-                    'description': _('%s installment of %.2f (total %.2f)' % (self.divisor, amount / self.divisor, amount))
+                    'description': _('%s installment of %.2f (total %.2f)') % (self.divisor, amount / self.divisor, amount)
                 }