Would it be possible to ship the tarball with translations in the po directory? I previously made a bug report in Launchpad about this:
https://bugs.launchpad.net/ubuntu/+source/gcolor2/+bug/302630
I had this answer, among others:
David Planella wrote on 2009-10-18:
>By looking at the gcolor2 source package, it seems that the po directory
>contains no translations. This stems from the fact that the upstream tarball at
>http://sourceforge.net/projects/gcolor2/files/gcolor2/0.4/gcolor2-0.4.tar.gz/download
>was shipped with no translations.
>
>This is someting which cannot be solved by language packs, since gcolor2
>is not in the 'main' repository and thus cannot be translated in Ubuntu.
>
>I would recommend you to file a bug at the upstream project so that they
>include the translations. You can do it here:
>http://sourceforge.net/tracker/?func=add&group_id=119919&atid=685759