Documented various traits

There were still several undocumented https://github.com/OpenRA/OpenRA/wiki/Traits.
Disguise is not an easy word for non-native speakers. I also try not to just repeat the trait name to make it more understandable. I had http://de.pons.com/%C3%BCbersetzung?q=tarnen&l=deen&in=&lf=de in mind.