msgid = u'some_message',
default = u'Some message',
domain = 'myproductsi18domain')
and make sure you have something like
#. Default: "Some message"
msgid = "some_message"
msgstr = "Een bericht"
in the relevant file (probably i18n/myproductsi18ndomain-nl.po).
This has the disadvantage that the message strings are not recognized by i18ndude, so i18ndude will not automatically create the relevant strings for you in your .pot file. There's a workaround for this, but that's another blog post.