Removing messages from a catalog
This section discusses how to remove messages from a catalog using the $delset directive.
The $delset directive removes all of the messages belonging to a specified set from an existing catalog:
$delset n [ comment ]
The message set is specified by n. The $delset directive must be placed in the proper set-number order with respect to any $set directives in the same source file. You can also include a comment in the $delset directive.