[Merge] lp:~renatofilho/address-book-app/fix-1373517 into lp:address-book-app

[Renato Araujo Oliveira Filho]

> This only partially fixes the bug https://bugs.launchpad.net/address-book-
> app/+bug/1373494
> We also need to change the header title to "New Contact" or "Edit" depending
> on which mode you are in. See the bug description.

Fixed
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https://code.launchpad.net/~renatofilho/address-book-app/fix-1373517/+merge/244489
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