Labels in Comments Pagination block don't become translation ready.

[iamtakashi]

<!-- wp:comments-pagination-next {"label":"⪻ newer"} /-->
<!-- wp:comments-pagination-previous {"label":"older ⪼"} /-->

It'd be nice to make the labels internationalised when the theme is saved in CBT.

[t-hamano]

Thanks for the report. Let me close this issue as part of #776.