Re: [manifest] Add a lang member (#322)

But if we end up having some ```locales``` array like the Firefox Manifest, ```lang``` might be a bit pointless? Or would you re-use ```lang``` in there and it would apply for the scope? In which case, the way we would handle override would be a tad different from what Mozilla currently do. If you have no problem with that, I'm fine with adding ```lang```. (Note, I think it would kill ```default_locale``` too.)

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