I have installed accountsservice 0.6.15-2ubuntu9.6 from precise-proposed, and can still change the user language without problems. The bug reporter's successful use of version 0.6.15-2ubuntu9.5+nfs in my PPA, which was built from the same source as 0.6.15-2ubuntu9.6, should be considered to verifiy that the new version actually fixes the bug as expected.
I have installed accountsservice 0.6.15-2ubuntu9.6 from precise-proposed, and can still change the user language without problems. The bug reporter's successful use of version 0.6.15- 2ubuntu9. 5+nfs in my PPA, which was built from the same source as 0.6.15-2ubuntu9.6, should be considered to verifiy that the new version actually fixes the bug as expected.