error messages on login

[ev118]

Username can only contain letters and numbers but throws a strange error when this is violated.
Key: 'requestUser.baseUser.Username' Error:Field validation for 'Username' failed on the 'alphanum' tag Error: Key: 'requestUser.baseUser.Username' Error:Field validation for 'Username' failed on the 'alphanum' tag at https://peregrinefrc.com/index.js:1:28342

[varCepheid]

A branch exists to work on this issue called #login-error-message. There is not an open pull request for it, as it currently has no changes.