#995 + Huge translation update

1. #995 in one commit
2. Silver Powder -> SilverPowder + Thunderstone -> Thunder Stone
3. Update German + Spanish classification translations
4. Update French berry/move/pokemon translations
5. Update Italian gens/version translations + delete Italian description translations
6. Add Japanese item/berry translations
7. Update Japanese pokemon translations
8. Add Korean berry translations
9. Update Chinese gen translations