After a report from a user, and looking at the code, it seems that the <email address hidden> file is missing:
http://bazaar.launchpad.net/~ubuntu-branches/ubuntu/oneiric/ubiquity/oneiric/files/head:/po/
The translation for the Catalan (Valencian) variant (ca@valencia) is complete in Launchpad, and has been for a while. It should be correctly exported, so I'm wondering if it gets discarded by a script that fetches the translations, or something like that?
ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: ubiquity (not installed)
ProcVersionSignature: Ubuntu 3.0.0-12.20-generic 3.0.4
Uname: Linux 3.0.0-12-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 1.23-0ubuntu3
Architecture: amd64
Date: Thu Oct 20 11:22:55 2011
EcryptfsInUse: Yes
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Alpha amd64 (20110319)
SourcePackage: ubiquity
UpgradeStatus: Upgraded to oneiric on 2011-10-15 (4 days ago)
It's currently disabled in localechooser upstream because, presumably, that translation isn't sufficiently complete in d-i. As such, there's no point importing that translation into ubiquity because it won't be used. Somebody needs to work with d-i upstream to get that translation sorted out there.
Related:
http://