Add instructions to strip reviewers from localized title blocks

[zacharysarah]

This PR adds instructions for localized docs to strip reviewers from title blocks of localized files. This is to avoid bombarding reviewers from an increasing number of translation-specific @mentions.

Ref: kubernetes/community#2221 (comment)

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[tengqm]

/lgtm

[mdlinville]

As discussed in Slack, I think there is potential for automation here, so that the translators don't have to touch every file, every time we give them a new BOM, in this way.