wicd: fix dhclient interaction

wicd used to write dhclient config file into $out/var/lib/wicd directory attempting
to change nix-store. That didn't work and thats why we couldn't use dhclient.
With this patch wicd will generate temporary file name for this purpose. File is
generated each time the daemon starts.
wicd: bring translations back.
wicd: fix missing application icon
wicd: [HACK] fix various gtk issues

* hack around s.translate situation
* fix KeyError exception in error dialog
* fix Russian translation
wicd: remove unused patches, remove ast with plain rm
wicd: rename icons/hicolour to icons/hicolor
Merge pull request #429 from ierton/wicd-fixes

wicd: some fixes