Update fi.yml

Added many new translations and fixed numerous old ones.

Haven't translated here before so I'm not sure how high your requirements are, but I have a professional qualification on Gengo and have worked as a volunteer Steam translator/moderator, to name a few things.
Merge pull request #219 from Calade/patch-1

Update fi.yml
Merge branch 'master' into develop

Conflicts:
	config/locales/fi.yml