User can't create different versions of translation of one article into same language

Preconditions
User has permissions to create articles
Steps
1. Login into Antarticle as user
2. Click [Create Article] button"
3. Click to "Choose Language" combobox
4. Select language (ex.: English)
5. Fill required fields and Click [Create Article]
6. On article page click [Translate] button
7. Select the same language as in step 4
8. Fill required fields and Click [Create Article]

AR When i try to post article on existing language i get error "Article on selected language has been already created"
ER According to comments in Story http://jira.jtalks.org/browse/ANTARCTICLE-119, user should be able to create a number of translations of the article into the same language