feat: Search and BAT copy updates

[IanKrieger]

Update copy based on feedback on the Search and Basic Attention token landing pages

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[tackley]

Approved, assuming the copy has been reviewed by the necessary people.

[github-actions]

[puLL-Merge] - brave/ads-ui@1215

Description

This PR updates the Basic Attention Token (BAT) landing page and Search landing page with new content and styling. It adds sections explaining what BAT is and how it can be used to purchase Brave Ads, and provides more details on the benefits of Brave Search Ads. The changes aim to better inform potential advertisers about BAT and encourage them to start a campaign using the token.

Changes

Changes

BasicAttentionTokenLandingPage.tsx:

• Updates copy to clarify the 50% off promotion for BAT purchases
• Adds a "What's BAT?" section explaining what the token is and how it's earned/used
• Styles the main content section with a white background and curved borders
• Changes the CTA button to "Start a campaign with BAT"

SearchLandingPage.tsx:

• Increases the cited number of annual Brave searches to "more than 9 billion"
• Adds details on what Brave Search is and its growth
• Explains what Brave Search Ads are and their benefits
• Changes the CTA button to "Check eligibility"
• Aligns the text and image to be centered on desktop

SearchTalkingPoints.tsx:

• Updates the talking points with more specific language around reaching ad-blocking audiences, conversion rates vs Google, and the free trial

en.po, es.po, pt.po, test.po:

• Updates translated strings for the related text changes

Overall, the PR focuses on providing clearer information to help convert interested advertisers, especially those looking to use BAT. The changes are primarily content-focused with some light styling improvements.