[backend][admin] Remove the extra forms for environment language handling

This makes the environment creation and management clearer.

Fixes #565
1 job for 565_fix_environemnt_language_admin in 15 minutes and 36 seconds (queued for 6 seconds)
Status Job ID Name Coverage
  Build
passed #209169
docker-build
build_linux_36

00:15:36

66.0%