rename fields to improve understanding, adapting maintenance.py (intermediate)

games/rpg/valyria_tear.md

@@ -5,11 +5,11 @@ _J-RPG (Based on the Hero of Allacrost engine)._
 - Home: https://valyriatear.blogspot.de/
 - Download: https://valyriatear.blogspot.de/p/downloads.html
 - Keywords: JRPG
-- Code: https://github.com/ValyriaTear/ValyriaTear
-- Language(s): Lua, C++, C
+- Code repository: https://github.com/ValyriaTear/ValyriaTear
+- Code language: Lua, C++, C
 - Code license: GPL
 
 ## Building
 
-Uses CMake
+- Build system: CMake