There are some nice things in it.
So I suggest you leave it like it is now  
 e.g.: 
muted users translation: 
gedämpfte Benutzer"gedämpft" sounds more like "steamed or damped" - you can use that term for cooking 

Possible translation would be: "
Stumme Benutzer"
...but every german gamer would rather use "muted users".
Requirements - 
Bedarf could be 
AnforderungenSee who is playing right now! - 
Sehen Sie, wer jetzt spielen! Should be: 
Sehen Sie, wer jetzt spielt!User Ranking   -  
Benutzer RankingFull translation: 
Benutzer Ranglisteor better: 
Spieler RanglisteBut again I wouldnt translate such common terms.
People should be able to write/read some basic english, and words like " User" or "who is online" ...
I still doubt that we need any of these translations on a server where only english is allowed in normal chat and forums... 
 maybe its a nice "welcome" for players, but that could have been done in other ways.
example:
Just show the Flags...and if people click on them, they see some "welcome to maxko" message in their language + a readout where you can see how many players are logged from a country.