Implementation Notes & PageFactory (Minor Fixes)

[kathyrollo]

Hey @diemol , complementary PR to #1387

Description

• Added syntax highlighting for code examples.
• Remove mentions of PageFactory.
• Added emphasis on important points.
• Minor additions to code comments for clarity.

Motivation and Context

• Code samples must have syntax highlighting where possible to improve readability.
• PageFactory has been discouraged for a while (Simon Stewart, SeleniumConf 2017) and should no longer be encouraged for Selenium 4.x onwards to modernise solutions.
• Added mention of Martin Fowler's "panel objects" for historical significance, as the most common misconceptions of the Page Object stem from this missed footnote.

Types of changes

• Change to the site (I have double-checked the Netlify deployment, and my changes look good)
• Code example added (and I also added the example to all translated languages)
• Improved translation
• Added new translation (and I also added a notice to each document missing translation)

Checklist

• I have read the contributing document.
• I have used hugo to render the site/docs locally and I am sure it works.

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[diemol]

Thank you, @kathyrollo!