Locales don't work in chroot sid

[Tommi Höynälänmaa <tommi.hoynalanmaa@gmail.com>]

I have just installed sid to a chroot. Locales don't work even though I 
have installed package locales. Scandinavian letters are not displayed 
and guile gives the following warning:

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guile: warning: failed to install locale
warning: failed to install locale: Invalid argument

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Perl gives the following warning:

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perl: warning: Setting locale failed.
perl: warning: Please check that your locale settings:
    LANGUAGE = (unset),
    LC_ALL = (unset),
    LANG = "fi_FI.UTF-8"
    are supported and installed on your system.
perl: warning: Falling back to the standard locale ("C").

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How can I make the locales work in a chroot sid?

     - Tommi Höynälänmaa