Add Black Friday Notice & Prepare Release v2.1.9

[kawsarahmedr]

Add Black Friday Notice & Prepare Release v2.1.9

This pull request updates the plugin to version 2.1.9, introducing improvements to code quality, updating admin notices for the Black Friday promotion, and fixing several known issues. The changes also include minor enhancements to translation files and dependency updates.

Release and Promotion Updates:

• Bumped plugin version to 2.1.9 in package.json, wp-content-pilot.php, and internal version property, with corresponding changelog entry in readme.txt. [1] [2] [3] [4]
• Replaced the Halloween admin notice with a new Black Friday Mega Sale notice, including updated text, coupon code, and validity period in includes/class-wpcp-notices.php and translation file. [1] [2] [3]

Code Quality and Issue Fixes:

• Improved sanitization of GET parameters in the logs table by using wp_unslash before sanitizing, addressing potential data handling issues. [1] [2]
• Removed commented-out legacy translation provider option from the advanced settings metabox.

Dependency and Translation Maintenance:

• Updated @wordpress/scripts devDependency to version 31.0.0 in package.json.
• Refreshed translation template file i18n/languages/wp-content-pilot.pot for version and date, and adjusted line references for translation strings. [1] [2]