Mobile Version Language Toggle should show current locale

### Have you read the Contributing Guidelines on issues?

- [X] I have read the [Contributing Guidelines on issues](https://github.com/facebook/docusaurus/blob/main/CONTRIBUTING.md#reporting-new-issues).

### Prerequisites

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

### Description

When we are facing a multilingual website, it's important to indicate the change language toggle.
We achieved a good result in the desktop version but I think in such a scenario, it's better we follow the desktop version to show the current language beside the icon instead of the `English` version of toggle only.
In the above image, I prefer to see `فارسی` instead of `Languages`
or when its English, I prefer to see `English` instead of `Languages`

### Reproducible demo

_No response_

### Steps to reproduce

https://iammassoud.ir/

### Expected behavior

https://iammassoud.ir/

### Actual behavior

https://iammassoud.ir/

### 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

- [x] I'd be willing to fix this bug myself.