Although my question is not about KDE, it s about KStars which is a part of KDE project.
Therefore, I hope somebody here can help me.

I am using Ubuntu 8.10. I installed KStars in the standard way (via Synaptic).
I would like to use KStars with a language other than English. How do I switch the language?

Help > Switch application language. Change the "primary language" to the language desired.

bcooksley wrote:Help > Switch application language. Change the "primary language" to the language desired.

I do not see the item "Switch application language" in the "Help" menu.

Here is the version info:
KStars
Version 1.4.2
Using KDE 4.1.4 (KDE 4.1.4)

Is my version too old?

Where can I get a newer one?
I cannot fin the link to a download page from http://edu.kde.org/

It should be there. Please check to ensure that you have installed the KDE language pack for the language you wish to use. This can be installed through your package manager, although the name differs between distributions.