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

Note that:
* Having multiple manifest files per app prevents the manifest URL being used as an app identifier.
* Having a dynamically generated manifest prevents the manifest being signed for the purpose of granting permissions.

I know that neither of these requirements are things that everyone agrees on, but I wanted to call out that they may make certain things impossible in the future.

And FWIW I don't actually think having multiple locales in a single manifest is particularly messy.

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https://github.com/w3c/manifest/issues/322#issuecomment-77618924