StringTable.txt[en]: Fix some spelling errors

http://www.forum.birth-of-the-empires.de./viewtopic.php?p=32442#p32442

- Change diction for planet classes I,J and M:
	comprised = composed of
	comprised of = composed of
	comprises = comprise

- Add English text for the eighth Rotharian troop.

- Fix the following spelling errors:
conntect = connect
Ecomomic = Economic
gamesettings = game settings
Playername = Player name

Servername = Server name
IP-adress = IP address
traderoutes = trade routes
resourceroutes = resource routes

Sytem = System
tausend = thousand
bevor = before
high-uv radiation = high UV radiation

particels = particles
spacetime = space-time
Gameover = Game over
gouvernment = government

bombardements = bombardments
maschines = machines
conquesting = conquering
datter matter = dark matter