Comment 15 for bug 46156

This affect the french translation in Kubuntu feisty too.

To solve this problem, I found this workarround in a french blog (while waiting the official release to correct it)
source (french):
http://www.souslestoits.net/blog/index.php/post/2006/11/03/76-quanta-plus-de-nouveau-en-francais
The blog says a file is missing in the kde-i18n-fr package

solution given:
install the normal translation package
sudo apt-get install kde-i18n-fr

then
get this package directly from kubuntu edgy
wget http://kubuntu.org/packages/kde-356/pool-edgy/kde-i18n/kde-i18n-fr_3.5.6-0ubuntu1~edgy1_all.deb

uncompress it
dpkg -x kde-i18n-fr_3.5.6-0ubuntu1~edgy1_all.deb kde-i18n-fr

and copy it to the right place
sudo cp kde-i18n-fr/usr/share/locale/fr/LC_MESSAGES/quanta.mo /usr/share/locale/fr/LC_MESSAGES/

note: the package kde-i18n-fr is not included when installing quanta, so I think the best solution is to correct the quanta package AND the kde-i18n-XX package

Hope this help