Steps to reproduce the issue

goto backend (using language DE)
click system => site templates => cassiopeia
click button "copy template" and select a name including character "-"
The description text is "Den Namen des neuen Templates eingeben. Es dürfen nur Buchstaben, Zahlen und Unterstriche benutzt werden."

Expected result

an error message like "Fehlerhafter Template-Name! Es dürfen nur Buchstaben, Zahlen und Unterstriche benutzt werden. "

Actual result

error message is "Fehlerhafter Template-Name! Es sind nur Buchstaben, Zahlen, Binde- und Unterstriche erlaubt."

System information (as much as possible)

Didn't know howto tell, that we talk about J4 RC3

Additional comments

Maybe also use same syntax as in description text, which is correct