Implement runtime language selection

Signed-off-by: Pauli Nieminen <suokkos@gmail.com>
Check for a new version if known to have newer version

If there is already a new version available don't wait 7 days to check
again for the latest version if clock is restarted.

Signed-off-by: Pauli Nieminen <suokkos@gmail.com>
Allow user to ignore the upgrade message

Signed-off-by: Pauli Nieminen <suokkos@gmail.com>
Update Finnish and English upgrade reminder text

Signed-off-by: Pauli Nieminen <suokkos@gmail.com>