Fix typo in de.xml
Fix typo in de.xml

See https://community.woltlab.com/thread/286689-sprachvariable-im-acp-von-option-inhalte-von-externen-anbietern/

Closes #3721

Cyperghost/WCF,WoltLab/WCF,WoltLab/WCF,WoltLab/WCF,Cyperghost/WCF,SoftCreatR/WCF,Cyperghost/WCF,WoltLab/WCF,Cyperghost/WCF,SoftCreatR/WCF,Cyperghost/WCF,SoftCreatR/WCF,SoftCreatR/WCF