Problem with internationalization of bottom navigation on docs page

[huangj17]

Have you read the Contributing Guidelines on issues?

• I have read the Contributing Guidelines on issues.

Prerequisites

• I'm using the latest version of Docusaurus.
• I have tried the npm run clear or yarn clear command.
• I have tried rm -rf node_modules yarn.lock package-lock.json and re-installing packages.
• I have tried creating a repro with https://new.docusaurus.io.
• I have read the console error message carefully (if applicable).

Description

In the first page with subpages, the internationalization of the parent page title displayed at the bottom does not display properly

Reproducible demo

No response

Steps to reproduce

1. Open the official link: https://docusaurus.io/zh-CN/docs/docs-introduction.
2. Slide to the bottom.
3. View the title of "Previous".
4. 

Expected behavior

Expected bottom navigation, normal display of internationalized title

Actual behavior

Your environment

• Public source code:
• Public site URL:
• Docusaurus version used:
• Environment name and version (e.g. Chrome 89, Node.js 16.4):
• Operating system and version (e.g. Ubuntu 20.04.2 LTS):

Self-service

• I'd be willing to fix this bug myself.

[slorber]

This is a known issue of i18n and generated index pages: the docs pagination buttons (next/previous) are not translated.

Let's track it here: #8996

This has also been discussed here: #10753

And a previous PR attempt: #8123