Hi Nicholas,
thank you very much for your answer.
Hmmm, i'm a retard. I already found the presence.js file and noticed the presence entries. My mistake was, that i thought its only the color settings there. I haven't thought about you are using the array index keys as the text labels too. I thought there is another place where you reference this array keys with the colors to add somewhere else defined lables. 
Now i understood that the array keys are the text labels as well. I changed them and all works fine now.
Thank you again for your effort.
Greetings
JoTo