chore(theme-translations): complete ar translations

[Altomy]

Pre-flight checklist

• [x ] I have read the Contributing Guidelines on pull requests.
• [x ] If this is a code change: I have written unit tests and/or added dogfooding pages to fully verify the new behavior.
• [x ] If this is a new API or substantial change: the PR has an accompanying issue (closes #0000) and the maintainers have approved on my working plan.

Motivation

Change some language texts in Arabic locale

Test link

https://deploy-preview-7683--docusaurus-2.netlify.app/

Related issues/PRs

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[github-actions]

⚡️ Lighthouse report for the deploy preview of this PR

URL	Performance	Accessibility	Best Practices	SEO	PWA	Report
/	🟢 93	🟢 100	🟢 100	🟢 100	🟢 90	Report
/docs/installation	🟠 87	🟢 100	🟢 100	🟢 100	🟢 90	Report

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[Josh-Cena]

Thanks

Could you complete the missing ones as well?

[Altomy]

Thanks

Could you complete the missing ones as well?

Yes of course 😍

[Josh-Cena]

Thank you for your contribution!