#5181768 Pricing page i5: update copy

Changes proposed in this Pull Request

This PR updates the copy of pricing page i5.

Fixes 1196341175636977-as-1199149328812578

Implementation notes

• Iteration checks are not ideal, it’s gonna be dealt with later in another PR
• Case of features is not consistent in the mockups, don’t mind it
• Don’t check the FAQ
• First feature in Anti-spam should probably be “Always-on spam protection” to match the feature in Security Daily

Testing instructions

• Download the PR or visit the Calypso live link
• Run Calypso or Jetpack cloud
• Make sure you selected variant i5 of a/b test jetpackConversionRateOptimization
• Select a self-hosted Jetpack site
• Visit the pricing page
• Check that the copy matches the mockups (link attached in task). Specifically:
  • Check the titles of the plans and products cards
  • Check that Search has been replaced by Site Search everywhere
  • Check the features lists