CMS Made Simple Forums

Hi

I want to install a login page that my customer can login and
see some stuff I want to give him when working on a project.

I am in Finland so the client must have also the panel in
finnish language.

I have made a test user but the language is still in english.
However I managed to change the language in finnish in admin
but how I can change the users language?

Also there should be a simple login page which is different than
administrator page. Perhaps a customised login page.
How can I do this?

Thanks