[docs] Updating resource page

[fellyph]

This pull request updates the WordPress Playground resource page across multiple languages. The main focus is on expanding resource listings, adding a recent presentation from Fellyph at WordCamp Wroclaw, and making minor corrections for clarity and consistency on the Portuguese Translation.

Resource and Content Updates:

• Added a new video link, "WordPress Playground: The Path to Test Automation," to the resources in English, Spanish, French, and Japanese documentation files. [1] [2] [3] [4] [5] [6]
• Improved and expanded the list of resource redirections (links to Playground tools and services) in Japanese and Brazilian Portuguese documentation, ensuring consistency with the English version. [1] [2]

Localization and Translation Improvements:

• Updated and corrected various resource titles, descriptions, and section headings in the Brazilian Portuguese documentation for better clarity and localization. [1] [2]
• Improved the translation of guide titles for plugin and theme developers in Brazilian Portuguese. [1] [2]
• Added and refined Japanese translations for new and existing video resources. [1] [2]

Minor Corrections:

• Fixed typos and improved terminology (such as "dev enviroment" to "dev environment") in Japanese and Brazilian Portuguese resource listings. [1] [2] [3]

These changes help ensure that users across all supported languages have access to up-to-date, accurate, and well-localized documentation resources.