ISO 3166-2: Fix subdivision names for Finland. Fixes #37
The commit 229d45da resurrected inconsistent language choice for subdivision names for Finland which were once fixed by !27 (merged).
In order to adhere the recommendations of The Finnish and the Swedish Language Boards of the Research Institute for the Languages of Finland (see for instance Toponymic_guidelines.pdf), this CL:
- Fixes data/iso_3166-2.json to use consistent language for Finland (Swedish for FI-01 and Finnish for the rest from FI-02 to FI-19). See #37 (closed) for details.
- Updates gettext msgids accordingly.
- Restores translations which were lost by 271d93ff after 229d45da.