cleanup of keywords, a few new additions from the backlog

entries/freeserfnet.md

@@ -3,11 +3,11 @@
 - Home: https://github.com/Pyrdacor/freeserf.net
 - Inspiration: Freeserf, The Settlers
 - State: mature
-- Keyword: remake, strategy, requires original content
+- Keyword: remake, strategy, content original required
 - Code repository: https://github.com/Pyrdacor/freeserf.net.git
 - Code language: C#
 - Code license: GPL-3.0
 
 ## Building
 
-- Build system: Visual Studio solution
+- Build system: Visual Studio