Multilanguage Application Interface

I want to add a second language to my application interface. I've found a Language section in the configuration tree and added the new one there, but cannot get the point what to do next? If someone knows? How can I set the second language values to field items and what to check in the Script to define which string value to pass to DoMessageBox?

Use the NStr function:

DoMessageBox(NStr("ru = 'Добрый вечер!'; en = 'Good Evening!'"));

Thank you!
And what about form field labels?

Press Ctrl-Shift-F4 on Title property

Yep, that did the trick! Thank you, Evgeny!