Problem

Arabic localization files for preference view controllers are completely missing. This prevents Arabic-speaking users from seeing properly localized preference UI.

Current State

• MPMarkdownPreferencesViewController: 0 lines (expected: 42 lines)
• MPTerminalPreferencesViewController: 0 lines (expected: 18 lines)
• MPGeneralPreferencesViewController: 0 lines (expected: 27 lines)
• MPHtmlPreferencesViewController: 0 lines (expected: 63 lines)
• MPEditorPreferencesViewController: 0 lines (expected: 63 lines)

Total: 0/213 lines (100% incomplete)

Expected Behavior

All preference controls should display with proper Arabic translations, matching the completeness of Japanese, Chinese, French, and German localizations.

Special Considerations

• Arabic is a right-to-left (RTL) language
• May require additional UI layout testing to ensure RTL display works correctly
• Consider consulting with native Arabic speakers for translation quality

Files to Create/Update

1. MacDown/Localization/ar.lproj/MPMarkdownPreferencesViewController.strings
2. MacDown/Localization/ar.lproj/MPTerminalPreferencesViewController.strings
3. MacDown/Localization/ar.lproj/MPGeneralPreferencesViewController.strings
4. MacDown/Localization/ar.lproj/MPHtmlPreferencesViewController.strings
5. MacDown/Localization/ar.lproj/MPEditorPreferencesViewController.strings

Reference

Use Japanese localization files as structural reference for translation keys.

Priority

MEDIUM - Affects international users, may require RTL UI testing

Related Issues

Related to #40 (Korean localization completed)