Description of problem:
Leaving an empty input field and pressing add creates a language called "Root" which is basically unusable.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. Log in as admin, go to Menu->Administration->Manage Languages
2. Click Add New Language
3. Press Save
A language called Root is added, that lacks a locale id and has Root, root as the normal and native names.
"Field cannot be empty" error
VERIFIED with Zanata 3.6.0-SNAPSHOT (git-jenkins-zanata-server-github-pull-requests-2254)