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

games/action/mechcommander2_omnitech.md

@@ -5,10 +5,9 @@ _Upgraded and more easily moddable version of the good old Mechcommander 2._
 - Home: https://github.com/Echelon9/mechcommander2-open, http://www.hard-light.net/forums/index.php?board=210.0
 - Media: https://en.wikipedia.org/wiki/MechCommander_2
 - State: beta, inactive since 2013
-- Keywords: {XX}
-- Code: http://www.hard-light.net/forums/index.php?board=210.0
-- Language(s): C++
-- License: MPL
+- Code repository: http://www.hard-light.net/forums/index.php?board=210.0
+- Code language: C++
+- Code license: MPL
 
 ## Building