Merge branch '469-username-should-not-contain-special-and-space-character' into 'develop'

Resolve "Username should not contain special and space character"

Closes #469

See merge request !190
Status Job ID Name Coverage
  Test
passed #16995
test:php

00:00:19

passed #16994
allowed to fail
test:typoscript

00:00:29

 
  Build
passed #16996
build

00:00:30

 
  Layout
passed #16997
layout

00:01:58

 
  Deploy
passed #16998
deploy-develop

00:01:35