Add zh-HK: "pagination" entry

[ddnexus]

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[benkoshy]

@thattimc

Thank you again for your contribution to the zh-HK locale.

We are in the process of improving the labelling of pagy helpers in order to comply with the ARIA standards.

We are seeking your advice with the pluralized translation of the "pages" label, for each required plural listed below:

	page_label: "Pages (plural) in the locale ?"

If you are inclined: feel free to create a PR or alternatively post a comment with the translations and we can manage the PR crediting you.

Thank you in advance for your help!