when trying to update the current German translation, I wasn't presented the translated settings dialog. I guess some xfce-utils stuff is missing for inclusion or in the autoconf stuff. The previously translated 4 other plugins appeared in their translated version.
Anyone might want to check and compare against working translations.
I believe this is fixed by commit 2f7d6e565e9ce842a160cfdc9f0688222bdad560
(In reply to comment #1)
> I believe this is fixed by commit 2f7d6e565e9ce842a160cfdc9f0688222bdad560
sorry, still not working with a fresh git clone of xfce4-diskperf-plugin. Couldn't quickly make it working on my own neither.
Created attachment 3950
Commited in http://git.xfce.org/panel-plugins/xfce4-diskperf-plugin/commit/?id=614be858629a24cd730679e38fc795f9456fb817