Add Finnish language

[nijel]

Support for Finnish language has been requested in Debian BTS:

http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=688501

[nijel]

Also related to #14

[nijel]

Patches welcome, see documentation at https://github.com/nijel/enca/blob/master/DEVELOP.md

[Syed-Shahrukh-OSSRevival]

#86 closes this issue.