Change English Alt text to Tunisian

[ayushbishtcode]

Before submitting this pull request, check the changes to see it's only the changes you made intentionally
If there are changes to other lines you didn't make deliberately, it's possible that your IDE made the changes with a utility like prettier.
Next time, make sure that you only add your changes by using git add -p and rather than git add Contributors.md

If you're doing something in the checklist below, put an x inside [ ] so that - [ ] becomes - [x]

• [ ✔️] I had fun going through this tutorial (ノ^o^)ノ and learned on the way ٩(＾◡＾)۶
• There are some things I'd like to improve in this tutorial. I have written them below.
• There were steps where I had errors while following this tutorial. I have written them below.

[github-actions]

Thank you for your pull request. This pull request contains changes in files which requires review. The following files were changed:

• Contributors.md
• docs/translations/README.tn.md

[ayushbishtcode]

In README.tn.md, “copy URL to clipboard” should be translated into Tunisian. However, there is no such image in this file, even though the main README mentions changing it as well.