PeaZip 2.2 was release yesterday.
It is available as installable and also as standalone application not needing installation; in both cases in peazipdirectory/res/altconf.txt you can set absolute or relative path of application's configuration files if you keep the application in a path that is not writeable for the current user, or i.e. if you want to store configuration for multiple users in a shared path for administrative purposes.
It supports UTF-8, localizations (so far only Italian and English, I hope more will come with the help of the community), bookmarks etc... you can see full changelog on http://peazip.sourceforge.net/
To contribute localizations you can download this package which contains instructions, sample language files (UTF-8 txt files) and spreadsheets in ods and xls formats to help translators: