Extra language packs are not installed in OEM mode, leaving desktop partially untranslated

[Jean-Baptiste Lallement]

Test Case
1. Do an OEM installation in English
2. Boot a first time and click on 'Prepare for shipping'
3. Reboot
4. During end user setup, select 'French' and proceed with the setup

Actual Result
Extra language packs for French are not installed and the desktop is partially translated.

ProblemType: Bug
DistroRelease: Ubuntu 17.10
Package: ubiquity (not installed)
ProcVersionSignature: Ubuntu 4.13.0-16.19-generic 4.13.4
Uname: Linux 4.13.0-16-generic x86_64
ApportVersion: 2.20.7-0ubuntu3
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Mon Oct 16 16:06:07 2017
EcryptfsInUse: Yes
InstallationDate: Installed on 2017-10-16 (0 days ago)
InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Release amd64 (20171016)
SourcePackage: ubiquity
UpgradeStatus: No upgrade log present (probably fresh install)

[Ubuntu QA Website (ubuntuqa)]

This bug has been reported on the Ubuntu ISO testing tracker.

A list of all reports related to this bug can be found here:
http://iso.qa.ubuntu.com/qatracker/reports/bugs/1723959