> It seems pdfarranger could not deal with it. That's a pity. Indeed. Even version 1.6.2 (the latest) cannot. May be 1.7.0 will (may be not). In the meantime you have to decrypt the pdf file with another tool (ex: qpdf), before importing it in pdfarranger.
> So the bug is a combination of wrong LANG handling and missing feature, > I think. Yes there is a mismatch in the german translation but 1.1.1 is old so I (I'm the upstream) won't fix it.