Adding Catala as new language in notebooks/translated rag_zephyr_langchain

[JanLeyva]

What does this PR do?

This PR adds the folder ca to the notebooks directory. The purpose is to include translated notebooks in Catalan, as well as to translate the rag_zephyr_langchain notebook into this language. I have already translated Index.md inside the ca folder and made modifications to _toctree.yaml as well.

This marks my first contribution, and I welcome any feedback!

Who can review?

Someone that can check I did the structure properly, no technical changes made just translated a notebook and added a language.
@adeenayakup @MKhalusova

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[JanLeyva]

@MKhalusova @davanstrien can you please take a look? or give me feedback, thanks!

[artyomboyko]

@JanLeyva Hello. In order to fully add language support, a couple more edits need to be made.

You can see how I did it for Russian.

[JanLeyva]

@blademoon added ca as a language in build_documentation.yml and build_pr_documentation.yml in .github/workflows. Thanks for pointing this out, completely missed this step.

[artyomboyko]

@stevhliu Good day. Can you approve doc preview building?

[stevhliu]

Thanks for translating to Catalan!

I can't speak/read the language though, so would it be possible for you to find someone who may be interested in reviewing your translation for accuracy? The forums or Discord could be good places to find a potential collaborator 🙂

[stevhliu]

This wasn't aligned which caused the doc building to fail. I think it'd also be nice to translate the title of the recipe here to Catalan

Suggested change

	- local: rag_zephyr_langchain
	- local: rag_zephyr_langchain

[stevhliu]

I noticed some of this isn't translated to Catalan yet.

[JanLeyva]

Thanks for checking!

I just fixed the problem with _toctree.yml sorry about that, as well as full translated index.md to catalan. I'll look for more collaborators there, really appreciated!

[HuggingFaceDocBuilderDev]

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