When runing enigmail in thunderbird with swedish locales LANG=sv_SE.utf8 the extenitons doesn't do anything, trying to get into the preferences, gives the following error, yes sorry the message is partly in swedish:
XML-tolkningsfel: odefinierad entitet
Adress: chrome://enigmail/content/pref-enigmail.xul
Radnummer 111, Kolumn 20: <description>&enigmail.keepCryptoSettingsForReply.tooltip;</description>
-------------------^
A quick search on the internet gives that this probably is the same error as seen here:
http://www.mozilla-enigmail.org/forum/viewtopic.php?f=6&t=203
Using english locales for thunderbird and the package works as one expects.
ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: enigmail 2:1.3.2-0ubuntu1
ProcVersionSignature: Ubuntu 3.0.0-13.22-generic 3.0.6
Uname: Linux 3.0.0-13-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 1.23-0ubuntu4
Architecture: amd64
Date: Sun Nov 6 11:27:26 2011
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427.1)
ProcEnviron:
SHELL=/bin/bash
PATH=(custom, user)
LANG=sv_SE.utf8
SourcePackage: enigmail
UpgradeStatus: Upgraded to oneiric on 2011-10-17 (20 days ago)
Confirmed the same with fi_FI, enigmail doesn't work at all on oneiric.