There is my ISPconfig codes and translations.
Open terminal in your server (or use SSH)
Then use these commands:
cd /usr/local/ispconfig/interface/lib/lang/
mv fi.lng fi.lng.bak
wget https://raw.githubusercontent.com/theel0ja/ispconfig/master/fi.lng
# If everything went good, remove fi.lng.bak with this command:
rm fi.lng.bak