Finnish translations /improved

[donalde]

Attached our version of 2.7.x finnish locale we use at uni of joensuu. Merge?

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[Ari Lindholm]

... even better version

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[Ari Lindholm]

In this version: Corrected some typos, translated couple new terms and improved old ones.
Original FI-file was taken from 2.7RC2 package.

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