If you open a new topic and leave the clean name blank... the given clean name for german ä, ü, ö, ß is not correct
ä, ö, ü, ß should be ae, oe, ue, ss but it is a, o, u, sz

Quote:

Clean Name
Only alpha-numeric chars and dashes allowed

I'm not sure if it is correct for everyone... anyone I have updated the function and we will see.