Hello,
1. Do you have actual version of booking?
2. Both translations should be get from frontend translation file.
I have only problem to translate Object (capacity). Go to:
components/com_booking/views/reservations/tmpl/admin.php - line 125
and
components/com_booking/views/reservations/tmpl/customer.php - line 75
There is this line:
<?php echo JHTML::_('grid.sort', 'Object (capacity)', 'items-subject_title', $orderDir, $order); ?>
Modify it to:
<?php echo JHTML::_('grid.sort', 'Object _capacity_', 'items-subject_title', $orderDir, $order); ?>
And then translate:
OBJECT _CAPACITY_="Object (capacity)"
Expira column I have only in backend in actual version.