Pdf reports only in English?

Hello all,

I noticed in an up-to-date installation of Piwik, that Pdf Reports are available only in English, no matter, which default language is selected (in my case, it is German).
It also does not matter, if the reports are sent by email or downloaded.
Now my question: Is this merely a missing feature or actually a bug?
I found some related topics regarding this issue, but no clear answer, whether translations for Pdf reports are supported.
If it is a missing feature, is there any workaround to get translations?