RE: Is this license OK for main?
> Permission is granted to copy and distribute translations of
> this software into another language, under the above conditions
> for modified versions, except that this permission notice may be
> stated in a translation approved by the author.
> The last sentence may be a problem?
not at all, he is saying if you translate package foo into Japanese (for
instance), you may also translate this copyright notice into Japanese.
In general, questions like this are best sent to debian-legal or debian-mentors.