Improve i18n issues on billing page

What does this MR do and why?

Issue: https://jihulab.com/gitlab-cn/gitlab/-/issues/3775#note_4301952

Improve i18n issues on billing page.

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How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

MR acceptance checklist

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• I have evaluated the MR acceptance checklist for this MR.