games/fheroes2: update to 0.9.7

Changelog:

• Add basic German translation support and heavy update French and Polish translations
• Add missing Farm image part in Knight castle and modify Captain Quarters in Necromancer town
• Add AI hero classes for more efficient task distribution
• Fix multiple issues with combat logic for pathfinding and AI
• Fix object passabilities and incorrect rendering on World Map
• Over 60 bugs fixed since 0.9.6 release