There is a wrong german localization in the usermin configuration. It looks like someone used an automatic translation and changed e.g. ue -> ü which does not work in every case. The first word in the second sentence in the german translation is "Eventüll" but it should be "Eventuell".
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Thanks, I'll fix this in the next Webmin release. Let me know if you see any more occurrances of this type of mistake.