Changed the English label for the aliens from "Chargeman Ken" to be "Juralian" rather...

Changed the English label for the aliens from "Chargeman Ken" to be "Juralian" rather than "Alien Jural". That matches how they're called in the English Wikipedia page for "Chargeman Ken". Added an English description for those aliens. It doesn't attempt to follow what Google Translate gives for the Japanese description. Instead it gives a physical description (cribbed from the English Wikipedi a page) and mentions that these creatures are part of an alien invasion.