Update 20

Minor changes to tile coloring making them a bit more readable
Sharpened edges of Fog of War to highlight the edge of scouted area
Reduced maximum level cap for enemy heroes, thanks to Undercoverman for pointing this issue out
Minor performance optimizations
Better support for locale switching in game
Added notifications about effect charges in combat
Unit duplication bugfix
French localization improvement (thanks to Nathan)
Chinese localization improvement