The "registered" line should indeed be "true", maybe you logged in with a different name last time? Anyway, it doesn't matters regarding your current problem, since Widelands does not come so far. The "servername" is the name of the internet games you start. A bit strange, but no problem.
But something is definitely odd here. You do reach this forum with the same computer you are trying to run Widelands on, right?
You could try renaming the "config" file to something else so a new one is created. I doubt that this will change anything, though.
Another idea you could try: In the config file add the "metaserver" line as before, but try "wl.widelands.org" and "126.96.36.199" as possible values. Maybe one of those will work.
When you click on your Windows startmenu and immediately type "cmd" it should offer you a program called "command prompt" (or something similar). If you start that one it should give you a black console window. Can you please try the following four commands and tell me whether any answers have been received? (I think you can copy the commands here and past them in the console with mouse right click.)
ping -6 widelands.org
ping -6 2a01:238:4326:5100:b5ce:5c0b:f1f4:2e40
The first two commands should resolve our hostname and should print the IPs of the respective last two commands in their output.