If I try the locale fi_FI@euro or sv_FI@euro in locale field of config variables page, everything works fine. Only one locale works though in moodle.org you can change the language to swedish or finnish and the locales work always. I tried this:
fi_FI@euro,sv_FI@euro
and this:
fi_FI@euro;sv_FI@euro
in locale field of config variables page but then only the english locale worked.
I tried to change the default language also.