Cannot cancel pledge

I have localized (Russian) CiviCRM installation. When I try to cancel a pledge, nothing happens. In log I see
Notice: Undefined index: Cancelled in CRM_Pledge_BAO_Pledge::cancel() (line 1114 of <website root>/sites/all/modules/civicrm/CRM/Pledge/BAO/Pledge.php).
In than line I see:
$statuses = array_flip(CRM_Contribute_PseudoConstant::contributionStatus());

function CRM_Contribute_PseudoConstant::contributionStatus defined in file CRM/Contribute/PseudoConstant.php, line 311 this way:
public static function &contributionStatus($id = NULL, $columnName = 'label')

But column 'label' of contribution status contains localized (in my case Russian) label, so this function fails to find status with label 'Cancelled'.

I managed to cancel plegde by changing line 1114 of CRM/Pledge/BAO/Pledge.php to
$statuses = array_flip(CRM_Contribute_PseudoConstant::contributionStatus(NULL,'name'));
because column 'name' of contribution status contains non-localized status name. It might be better to change function definition to
public static function &contributionStatus($id = NULL, $columnName = 'name')
but I cannot research all concequences of such a change.