Pontoon: Update Finnish (fi) localization of Pontoon Intro
Pontoon: Update Finnish (fi) localization of Pontoon Intro

Localization authors:
- Lasse Liehu <lasse.liehu@gmail.com>

mathjazz/pontoon-intro,mathjazz/pontoon-intro,jotes/pontoon-intro,mathjazz/pontoon-intro,jotes/pontoon-intro,jotes/pontoon-intro