Thank you for your help, Alex T⚜️ . The calendar widget does not show in German while everything else does.
I found the following discussion on this https://una.io/page/view-discussion?id=7691 but I think with UNA-Cloud I cannot access the files to do the necessary changes.
For rocket change there is a missing translation in the liveagent widget. I believe this can be changed directly in the java script, but again I cannot access this on una cloud. All other items are in German, so that is ok.