Bug#184346: main-menu: fail to switch translation if languagechooser is configured as a dependency package

[Petter Reinholdtsen <pere@hungry.com>]

Package: main-menu
Version: 0.024

If I choose a package on the main menu that depends on
languagechooser, the language question appears before the package I
picked, and both packages seem to run their postinst script
successfully.  But when the last package is configured, the debconf
translation do not change.  It seems like I must pick languagechooser
from the menu to get a new language.  It is not enough that it is
installed as a dependency for other pachages.

I would expect debconf to change translation every time
languagechooser is installed, even if it is because another package
depends on it.