fix: with addition of forcing language in url and browser there was b…
Created by: xkureck
…ug in login page
- the login page was translated according to what is in url/browser setting - which is what we want in the user profile application
- but the same rules applied on the login page for admin gui - there the problem started
- if the supported language in admin-gui was also 'cs' the login page wanted to be also translated but, there was no translate file for cs.json
- that leaded to no text on login page