Restored translations

Hi,

I restored polish translations of examples (activities, categories) created in a fresh hamster.db.

Best Regards
Grzegorz Rynkowski

>Problem:    Example activities and categories fixed inside hamster.db are not translated.
>Solution:   Restored translations of these activities and categories.
>Verification:
>    1. Remove a hamster.db
>    2. Run hamster-service.
>    3. Check suggestions in a hamster window (or data in the hamster.db).