descriptions of entries checked and either incorporated to keywords and inspirations or redundancies removed

entries/planetary_hoppers.md

@@ -3,11 +3,9 @@
 - Home: https://sourceforge.net/projects/planets/, http://planets.sourceforge.net/
 - State: beta, inactive since 2003
 - Download: https://sourceforge.net/projects/planets/files
-- Keyword: strategy
+- Keyword: strategy, space, multiplayer online
 - Code repository: https://gitlab.com/osgames/planets.git (backup of cvs), http://planets.cvs.sourceforge.net/ (cvs)
 - Code language: Java
 - Code license: GPL-2.0
 
-Multiplayer space strategy game.
-
 ## Building