[i18n-ar] Translated file : `docs/source/ar/glossary.md` into Arabic
Author: AhmedAlmaghz
Pull request: yes


## What does this PR do?
Translated the `docs/source/ar/glossary.md` file of the documentation to `Arabic العربية`. I use transformers for my side-project and wanted to contribute. As a beginner, this seemed appropriate.

### Some questions:

- I can't access the pr documentation endpoint for `Arabic العربية`. Is there a missing step?
- I left all the other files alone after copying the English docs. Is this acceptable for future updates or should I add contents to the `_toctree.yml` only when translation is complete? Should I delete all other files for a cleaner review?
- In `Arabic`, people use both `Transformer` and `المحولات` to describe the model. However, as this is more of a product of HuggingFace I opted not to translate it. May you please let me know which you would prefer?

Thank you in advance for your review.

Part of #32435

### Before submitting

- [ ] This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
- [ ] Did you read the [contributor guideline](https://github.com/huggingface/transformers/blob/main/CONTRIBUTING.md#start-contributing-pull-requests), Pull Request section?
- [ ] Was this discussed/approved via a Github issue or the [forum](https://discuss.huggingface.co/) ?Please add a link to it if that's the case.
- [ ] Did you make sure to update the documentation with your changes? Here are the [documentation guidelines](https://github.com/huggingface/transformers/tree/main/docs), and [here are tips on formatting docstrings](https://github.com/huggingface/transformers/tree/main/docs#writing-source-documentation).
- [ ] Did you write any new necessary tests?

 ### Who can review?
 @stevhliu , @MKhalusova , @abodacs, may you please review this PR?
 

Comments:
The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/transformers/pr_33038). All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update.

> I can't access the pr documentation endpoint for Arabic العربية. Is there a missing step?

Once #32696 is merged, the doc-builder will generate a preview for Arabic.

> I left all the other files alone after copying the English docs. Is this acceptable for future updates or should I add contents to the _toctree.yml only when translation is complete? Should I delete all other files for a cleaner review?

Yeah, you can just work on one file at a time. In the future, once #32696 is merged, you'll add the translated doc to the `toctree` so it'll look like:

```md
- title: Get started
  sections:
  - local: index
    title: 🤗 المحولات
- sections
  - local: glossary
    title: (قاموس المصطلحات (قائمة الكلمات
```

> In Arabic, people use both Transformer and المحولات to describe the model. However, as this is more of a product of HuggingFace I opted not to translate it. May you please let me know which you would prefer?

When referring to a transformer model in general, you can translate it. When referring to Transformers the library, you can leave it untranslated.

@abodacs 
التالي :
🤗 Transformers #33040
 Quick tour #33069
 Installation #33041