I don't have access to an older astaro so not sure if it worked in earlier versions but in v8 you can use any character as dns hostname. I googled it and according to RFC3696, any characters, or combination of bits (as octets), are permitted in DNS names so technically we are OK[;)]
So for example Bill's PC sounds like a good dns name, but it doesn't work and I see where webadmin changes it to bill'spc (nice try) but obviously you can't resolve it using any client.
