[manifest] Added lang member (closes #322) (#324)

You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/manifest/pull/324

-- Commit Summary --

  * Added lang member (closes #322)

-- File Changes --

    M index.html (41)

-- Patch Links --

https://github.com/w3c/manifest/pull/324.patch
https://github.com/w3c/manifest/pull/324.diff

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https://github.com/w3c/manifest/pull/324