cant login to 3.0.0-RC3, strips underscore, changes character case

[ITServ-DE]

Request Type

Bug

Work Environment

Question	Answer
OS version (server)	Ubuntu
OS version (client)	Win7
Cortex version / git hash	3.0.0-RC3
Package Type	DEB
Browser type & version	IE, Crome 73

Problem Description

After updating from Cortex 2.x to 3.0.0-RC3, I can no longer log in, because the login screen strips an underscore character from my user name.

A Cortex installation where all Superadmins have special chars in it's name will be unusable after upgrading.

Steps to Reproduce

1. open Cortex 3.0.0-RC3 login screen
2. enter any username having an underscore (some_user)
3. enter any password
4. open and enable network tracing
5. hit the Sign In button

You will recognize the frontend calls /api/login with the login parameters, but it has mangled the user name and removed the underscore BEFORE sending it to the backend. As a result, the login fails.

Capital letters in the user name are converted to lowercase, and many other characters (like äöüß) get converted to spaces, too.

Random&User_Name$with§chars -> random user name with chars
Günther Müller -> gunter muller

[nadouani]

This is a duplicate of #199 which is already solved