Try/Install Ubuntu screen crashes when selecting a specific language

[Pierre Equoy]

Test done in Virtualbox 4.2.16 with this ISO:
http://iso.qa.ubuntu.com/qatracker/milestones/314/builds/66872/downloads

When selecting a specific language (see screenshot attached), the screen freezes, then crashes. Finally, Xubuntu (Live) is launched in English with a dialog box asking me if I want to report a problem.

Note: The problem happens only with this language. All the other ones, when selected, behave properly.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: ubiquity 2.18.6
ProcVersionSignature: Ubuntu 3.13.0-24.46-generic 3.13.9
Uname: Linux 3.13.0-24-generic x86_64
ApportVersion: 2.14.1-0ubuntu3
Architecture: amd64
CasperVersion: 1.340
CurrentDesktop: XFCE
Date: Wed Apr 16 12:46:59 2014
InstallCmdLine: file=/cdrom/preseed/xubuntu.seed boot=casper initrd=/casper/initrd.lz quiet splash -- maybe-ubiquity
LiveMediaBuild: Xubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140416)
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=fr_FR.UTF-8
 SHELL=/bin/bash
SourcePackage: ubiquity
UpgradeStatus: No upgrade log present (probably fresh install)