Hi David,
The booking add-on is listed in the plugins database as released for 2.0 to 2.4 branches, (https://moodle.org/plugins/view.php?plugin=mod_booking) but AMOS only has 2.0 to 2.3 strings, and the 2.4 strings are not available for translation .
Would you be so kind as to have a loook at it and show us what needs to be done by the plugin author?
Thanks in advance.