Bug 976574 - Implement 'Translation Preferences' option in infobar, r=felipe.

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extra : rebase_source : 240d73d8d852a1868bb96e39d61fc7a80a60621b
Bug 976574 - Implement 'Translation Preferences' option in infobar - tests, r=felipe.

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extra : rebase_source : f96151044fb083fa2c8e19d085c2a6a90700afe2