feat: add Polish language support (lang/pl/lang.php)

[jonatanpolak]

Add Polish Language Support for October CMS Redirect Plugin

Overview

This pull request adds complete Polish language support to the October CMS Redirect Plugin by introducing translated strings for all user-facing text and interface elements.

Changes Made

• Added: lang/pl/lang.php - Complete Polish language file
• Coverage: All plugin interfaces, error messages, validation text, button labels, and status messages
• Localization: Follows October CMS language file standards and naming conventions

Why This Matters

• Enables Polish-speaking users to use the plugin in their native language
• Improves accessibility and user experience for the growing Polish October CMS community
• Maintains consistency with the existing multi-language support (DE, EN, ES, FR, NL, RU, SV)

Testing

• Verified all translation keys are properly formatted
• Confirmed file structure matches existing language files
• Validated syntax and encoding (UTF-8)

Additional Notes

• Translations are professional and maintain the original context and tone
• No breaking changes or functionality modifications
• Ready for immediate use after merge

Files Changed

• lang/pl/lang.php (new file)

Request

Please review and consider merging this contribution to improve internationalization support for the plugin.