This is a really minor issue, but still. I am not sure if this in Webmin core or part of Authentic Theme, but if you enter incorrect login it gives:
Login failed. Please try again.
IT may sound ok in some other languages, but I believe a word "Danger" here is not very much appropriate for English as for malicious intruders will laughingly keep trying their dirty business (until of course Webmin blocks them) as for system owners it is a matter of just incorrect attempt, not danger per se.