[w3c/manifest] chore: mark i18n section as informative (#868)

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<a href="https://pr-preview.s3.amazonaws.com/w3c/manifest/pull/868.html" title="Last updated on May 18, 2020, 8:03 AM UTC (cbdb9e3)">Preview</a> | <a href="https://pr-preview.s3.amazonaws.com/w3c/manifest/868/8c7fd7b...cbdb9e3.html" title="Last updated on May 18, 2020, 8:03 AM UTC (cbdb9e3)">Diff</a>
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/manifest/pull/868

-- Commit Summary --

  * chore: mark i18n section as informative

-- File Changes --

    M index.html (2)

-- Patch Links --

https://github.com/w3c/manifest/pull/868.patch
https://github.com/w3c/manifest/pull/868.diff

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