Group Names and Unicode Letters
A discussion arose about the limitation of using German letters (ä, ö, ü, and ß) in group names. GuidoD pointed out that the error message does not specify that only ANSI letters are allowed. jomaxro noted that group names follow the same rules as usernames, which also do not mention ASCII only in their error message.
csmu questioned the technical reason behind not allowing these letters, which are indeed considered letters. gerhard explained that regular users are not familiar with ASCII, ANSI, and related terminology. He also expressed hope for lifting the ASCII restriction in the future, referencing a quote from codinghorror supporting the use of Unicode letter character sets in usernames.
However, jomaxro revealed that Unicode usernames and group names have been supported for some time, and the limitation can be lifted by enabling the “unicode usernames” site setting. GuidoD offered to update the German translation of the error message on Transifex to make it more understandable for German-speaking users.
the creation of a new group does now allow German letters (umlauts) like ä, ö, ü and ß
But it is not mentioned in the error message that only ANSI letters are allowed.
Would be good to mention it in the error message that only ANSI is allowed in the group names.
Group names follow the same rules as usernames. The username error also does not mention ASCII only. Username must only include numbers, letters, dashes, and underscores.
I’m not sure if adding “ASCII” to the error would be a good idea, however, as most users won’t know that is.
ä, ö, ü and ß are letters.
What is the technical reason as to why they are not allowed?
Unfortunately regular users usually do not know about ASCII, ANSI and such things. You are welcome to update the German translation of that error message on Transifex to make it easier for German speaking people to understand.
I really hope that we can lift the ASCII restriction for usernames and group names sometime in the future, but yeah, we have to live with it for now. Sorry about that.
I did there already a couple of the german translations for Discourse in the last couple of months. 
I will have a look at this specific error message on the weekend.
Unicode-Benutzernamen und Gruppennamen werden bereits seit geraumer Zeit unterstützt. Aktivieren Sie die Site-Einstellung unicode usernames.
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