Add Persian translation: Functions lecture

[mmcky]

This PR adds the Persian translation of the Functions lecture.

Changes

• ✅ Translated lectures/functions.md from English to Persian
• ✅ Updated _toc.yml to include the functions lecture
• ✅ Maintained all code examples in original English/Python syntax
• ✅ Preserved mathematical notation and formulas
• ✅ Applied RTL (right-to-left) formatting for Persian text

Translation Details

This lecture covers:

• Function basics and built-in functions
• Defining custom functions
• Keyword arguments
• Lambda functions
• Recursive functions
• Practical applications and exercises

Next Steps

After this PR is merged, the next lecture to translate would be python_essentials.

• translation to be reviewed by @Zahra-khanzadeh

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[mmcky]

@Zahra-khanzadeh sorry for my slow response on this project.

I have submitted a translation for the next lecture. When you have time, would you mind to please review it and let me know what quality of translation this is.

Can you let me know if this translation would be a useful starting point for your translation efforts? If Yes, I will setup a PR for ALL lectures.

[github-actions]

🚀 Deployed on https://68ff022ff29f22146dda0ee2--majestic-griffin-10b166.netlify.app

[Zahra-khanzadeh]

@Zahra-khanzadeh sorry for my slow response on this project.

I have submitted a translation for the next lecture. When you have time, would you mind to please review it and let me know what quality of translation this is.

Can you let me know if this translation would be a useful starting point for your translation efforts? If Yes, I will setup a PR for ALL lectures.

Thanks a lot for sharing this translation, @mmcky . It’s a great starting point and will really help speed things up! 🙏

I went through the text carefully. Overall it looks good, but some technical terms were translated a bit too literally, and a few sentences could be phrased more smoothly to sound natural in Persian.

In the pull request I made for python_by_example.md, I tried to fix the issue with how functions were displayed. The same issue exists in this section as well, and I can take care of fixing it.

[mmcky]

Thanks for the feedback @Zahra-khanzadeh. Great that it can be useful.

In the next week, I can open PRs for additional pre-translations for the next few lectures, but no rush on editing them.

[Zahra-khanzadeh]

Thanks so much, @mmcky . That sounds great! I’ve already updated my local files with the latest changes and can start editing this lecture soon.

Before I begin, I just wanted to check one thing with you.
For the parentheses issue (like in function calls), would you prefer that I fix them manually for now by placing the parentheses on the left side, as I did in python_by_example.md, or should I leave them unchanged since you’re exploring an automatic solution?

Once I know which approach you prefer, I’ll start editing and adjusting the translation accordingly.

Thanks again for your guidance and all your hard work on the theme improvements🙏