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

Translation authors:
- Lasse Liehu <lasse.liehu@gmail.com>
- teemu-vuori <teemu-vuori@outlook.com>

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