i18n: make example translatable in comments-pagination-previous

[yogeshbhutkar]

Part of: #64707
Tracker Comment: #64707 (comment)

What, Why & How?

This PR refactors the example attribute of block.json to support translatable text.

Testing Instructions

1. Create a comments block.
2. Add a pagination block to it.
3. Hover over the inserter to see the preview for comments pagination previous.

Screenshot

[github-actions]

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Co-authored-by: yogeshbhutkar <[email protected]>
Co-authored-by: t-hamano <[email protected]>

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[t-hamano]

I'm wondering why the label is the block name. Would the default placeholder text, Older Comments be appropriate here?

[yogeshbhutkar]

Thanks for the review @t-hamano. I've updated the label to Older Comments as that felt more appropriate to me as well.

Screenshot:

[t-hamano]

LGTM! Below is a screenshot in the Japanese locale, where I can see that the example text has been translated and matches the text immediately after the block is inserted.