Hotfix 2.1.18

NEW: DLC installation check for Linux @ GoG

UPDATE: Added tooltip to diamond reward on map items in main menu
UPDATE: Localizations (cs: research, tutorials, ui; ru: research, tutorials, ui; zh-Hans: research, tutorials, ui)

PERF: Itinerary recomputing took  extreme time in special case

FIX: Accepted one time offered contracts were being rejected on bulldozing the dispatcher office
FIX: Favorite map button was only shown on prague map for first time player
FIX: Tooltips for cycle explenation and rewards where missing on system upgrades page tier progression bar
FIX: Transport Demand Detail displayed misleading text when first and second demand was not generated yet