Updated promotions and some of the Korean translation keys

Restructured and reordered UnitPromotions.json
- Promotions are now under the following broad categories:
- Generic promotions
  - Without Prerequisites
  - With Prerequisites
- Special and unique promotions
- This would affect the order of promotions in-game.
- Also updated promotion translation keys in Template.properties.
- ...which partially addresses #33.
Updated promotion keys in Korean.properties
Updated Template.properties
- Added keys related to the Deadrock Clan and all eras
- Copied Clan keys from 9837e571e31d2490d763315dfa7643ee438f87de, thanks to @heipizhu4!
Updated Korean.properties
- Translated policies, major nation names, and eras
Dinghies now cannot enter ocean tiles
- But Trimarans can.

SpacedOutChicken / DeCiv-Redux