this command allows to (re-)generate a messages.pot file holding all strings to be translated from your module. If a messages.pot file is found, it will update it. otherwise, you will be prompted for a file location, with a default matching Locale::TextDomain settings:
$dzil potyup, underneath it just runs xgettext. and currently, it only finds calls to T() - but i'll add an option to provide your own convention such as _(), gettext(), etc.
[DZ] Trying to find a messages.pot file...
[DZ] No messages.pot found - enter your own.
messages.pot to use [lib/LocaleData/Foo-Bar-messages.pot]:
[DZ] Running xgettext...