Bug 928843 - start polishing the Australis history view by improving labels, r=jaws

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extra : rebase_source : 9ad68a9fc7a576168c2e179167b885c77efda2df
Bug 948213 - fix recently closed tabs not closing panel in Australis panel subview, r=jaws

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extra : rebase_source : 37915c9f0afe0fbcaa7748f14c39d970f25ee0c8