grouped fields after add another in inline admin form

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What steps will reproduce the problem?
1. create ModelAdmin with inlines of TranslationStackedInline (extra = 1)
2. display Add New Object
3. click Add another in inline admin form

What is the expected output? 
> expected output is grouped translation fields 
What do you see instead?
> it shows one field per language

What version of the product are you using? 
> version 0.3.3 (django 1.4)
On what operating system?
> Linux (Fedora)

Please provide any additional information below.
attached screenshots with step 2 and step 3

Original issue reported on code.google.com by viktor.vraniak on 26 Jun 2012 at 6:05

Attachments:

• addinline1.png
• addinline2.png

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Original comment by eschler on 6 Jul 2012 at 10:02

• Changed state: Accepted

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Original comment by eschler on 10 Jul 2012 at 9:38

• Added labels: Milestone-0.5

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Project moved to Github. All issues have been migrated preserving their id. All 
remaining open issues on GoogleCode are closed. New project url: 
https://github.com/deschler/django-modeltranslation

Original comment by eschler on 22 Oct 2012 at 8:22

• Changed state: MovedToGithub