[Bug-gnuzilla] Please add "(based on Mozilla Firefox ESR 31.8.0)" in About

[David Englund/Hedlund]

To make it crytsal clear, please add *"**(based on Mozilla Firefox ESR 
31.8.0)*" in Help -> About box like this: "IceCat 31.8.0 *(based on 
Mozilla Firefox ESR 31.8.0)*"

This should be done for Abrowser as well.
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