Add Arabic (ar) locale support

[hassanalitamam]

Summary

Add complete Arabic language support for PILOS with RTL configuration.

• 12 new translation files in lang/ar/ covering all application areas: UI, authentication, administration, room management, meetings, email notifications, validation messages, and system monitoring
• RTL support configured via metadata.json with appropriate date/time formatting
• Locale registry updated in existing language files (en, de, fr, fa) to include Arabic
• All translations use standard Arabic conventions for consistency across Arabic-speaking regions

Files Added

File	Description
lang/ar/metadata.json	Language metadata with RTL flag and date/time formats
lang/ar/app.php	General UI strings, errors, time formats
lang/ar/auth.php	Authentication and session management
lang/ar/admin.php	Administration panel
lang/ar/rooms.php	Room management and settings
lang/ar/meetings.php	Meeting and attendance tracking
lang/ar/home.php	Landing page content
lang/ar/mail.php	Email notification templates
lang/ar/validation.php	Laravel validation messages and custom attributes
lang/ar/passwords.php	Password reset messages
lang/ar/pagination.php	Pagination labels
lang/ar/system.php	System monitoring labels

Files Modified

• lang/en/app.php — Added 'ar' => 'Arabic'
• lang/de/app.php — Added 'ar' => 'Arabisch'
• lang/fr/app.php — Added 'ar' => 'Arabe'
• lang/fa/app.php — Added 'ar' => 'عربی'

Test Plan

• Switch to Arabic locale and verify RTL layout renders correctly
• Verify all translation strings display properly across all pages
• Confirm date/time formatting follows Arabic conventions
• Test locale switching between Arabic and other languages
• Verify email notifications render correctly in Arabic

Summary by CodeRabbit

• New Features

  • Full Arabic (العربية) localization added across the app: admin UI, auth, home, rooms, meetings, emails, validation, system texts, and pagination.
  • Right-to-left (RTL) metadata and date/time formats included for Arabic.
  • Arabic locale added to existing language selectors.

• Changelog

  • Added Arabic locale entry to release notes.

[coderabbitai]

Walkthrough

Adds full Arabic (ar) localization: 11 PHP translation files and a metadata.json with RTL support; updates four existing locale lists to include Arabic and updates the changelog. Files provide translations for admin, app, auth, home, mail, meetings, pagination, passwords, rooms, system, and validation.

Changes

Cohort / File(s)	Summary
Arabic translation files lang/ar/admin.php, lang/ar/app.php, lang/ar/auth.php, lang/ar/home.php, lang/ar/mail.php, lang/ar/meetings.php, lang/ar/pagination.php, lang/ar/passwords.php, lang/ar/rooms.php, lang/ar/system.php, lang/ar/validation.php	Added new Arabic translation arrays covering admin UI, general app strings, authentication, homepage, email templates, meetings/attendance, pagination, password messages, rooms feature, system monitoring, and comprehensive validation messages (including domain-specific overrides).
Arabic locale metadata lang/ar/metadata.json	New locale metadata with name "العربية", datetime formats, and "rtl": true.
Existing locale registrations lang/de/app.php, lang/en/app.php, lang/fa/app.php, lang/fr/app.php	Inserted 'ar' entries into existing locales arrays to register Arabic in locale selectors.
Changelog CHANGELOG.md	Added Unreleased entry noting addition of Arabic locale and PR reference.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

Possibly related PRs

• Add rtl support #2065 — Adds Arabic locale files and lang/ar/metadata.json with RTL flag; strongly related to this PR's Arabic resources.
• Add translation to locale selector #2079 — Updates locale-selector entries and relies on new 'ar' registrations; closely related.

Suggested reviewers

• danielmachill

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and specifically summarizes the main change: adding Arabic language support to the application.
Description check	✅ Passed	The description provides a comprehensive summary with clear sections (Summary, Files Added, Files Modified, Test Plan), though some required template sections are missing.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.77%. Comparing base (5f09fd3) to head (6f4b496).
⚠️ Report is 1 commits behind head on develop.

Additional details and impacted files

@@              Coverage Diff              @@
##             develop    #2798      +/-   ##
=============================================
+ Coverage      96.75%   96.77%   +0.01%     
  Complexity      1825     1825              
=============================================
  Files            440      440              
  Lines          12479    12479              
  Branches        2073     2073              
=============================================
+ Hits           12074    12076       +2     
+ Misses           405      403       -2     

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[samuelwei]

We are thinking about adding flags as an option to the locale dropdown.

@hassanalitamam Would this flag be a good fit?

https://commons.wikimedia.org/wiki/File:Flag_of_the_Arabic_language.svg