Log in screen will break when sent a invalid Accept-Language header 

4.19.8

Always

Run on MacOS

 '/Applications/Google Chrome.app/Contents/MacOS/Google Chrome' 'https://console-openshift-console.apps.qemtv-09.rhos-psi.cnv-qe.rhood.us/' --user-data-dir=$(mktemp -d) --incognito --accept-lang='en-US@posix' --ignore-certificate-errors 

or Run on linux

google-chrome --user-data-dir=$(mktemp -d) --incognito --accept-lang='en-US@posix' --ignore-certificate-errors https://console-openshift-console.apps.qemtv-09.rhos-psi.cnv-qe.rhood.us/

"en-US@posix" is a invalid language 
A blank screen will appear. "JavaScript must be enabled." error can be found on the browser Dev tools

Page is not functional, no clear error is shown

Fallback to default language OR display appropriate error message.