You use whos_online_plural for transforming words into their plural, but in the German language we have different Plurals for each category of inflection. So I think that you have to use an own wordlet for all words/sentences.
Donate to UBBDev today to help aid in Operational, Server and Script Maintenance, and Development costs.
Please also see our parent organization VNC Web Services if you're in the need of a new UBB.threads Install or Upgrade, Site/Server Migrations, or Security and Coding Services.