This pull request updates the WordPress Playground documentation to improve clarity, consistency, and user guidance across multiple languages. The main focus is on updating instructions and screenshots related to saving and restoring Playground sites, as well as refining terminology and adding helpful details.

Documentation improvements:

• Updated English, Spanish, French, and Gujarati docs to use new screenshots and folder structure for site manager/export/import actions, and clarified instructions for saving and restoring sites via the Playground dashboard panel instead of the old site manager panel. [1] [2] [3] [4] [5] [6]
• Improved terminology throughout, such as standardizing "Playground dashboard panel" and "Open Playground site manager," and updated figure captions and descriptions for clarity. [1] [2]
• Added new guidance and details, such as pop-up naming for saved playgrounds and clearer explanations for browser compatibility and temporary storage limitations.
• Enhanced Gujarati documentation with additional explanations, links to relevant guides, and improved translation consistency.
• Cleaned up Japanese documentation by removing redundant directory links and clarifying plugin/theme installation instructions.

Internationalization and translation updates:

• Synchronized instructions and screenshots across Spanish, French, and Gujarati translations to match the updated English documentation, ensuring a consistent user experience. [1] [2] [3] [4] [5] [6] [7]

These changes make the documentation more accurate and user-friendly, especially regarding site export/import workflows and multilingual support.