Use new instead of deprecated popover data attribute for mentions
Use new instead of deprecated popover data attribute for mentions

See #3318

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